2011 classical macrodynamics and the labor theory of value

8/14/2019 2011 Classical Macrodynamics and the Labor Theory of Value

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Classical macrodynamics and the

labor theory of value

Ian Wright

March 2011

NUMBER 76

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Classical macrodynamics and the labor theory of valueIan WrightEconomics, Faculty of Social Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA,

UK.a)

(Dated: 7 March 2011)

This paper outlines a multisector dynamic model of the convergence of market prices to natural prices in conditions

of fixed technology and composition of demand. Prices and quantities adjust in real-time in response to excesssupplies and differential profit-rates. Finance capitalists earn interest income by supplying money-capital to fundproduction. Industrial capitalists, as the owners of firms, are liable for profits and losses. Market prices stabilize toprofit-equalizing prices of production proportional to the total coexisting labor required to reproduce commodities.This result resolves the classical problem of the incommensurability between money and labor-value accounts inconditions of profits on stock, i.e. Marxs transformation problem.

This paper is primarily a philosophical analysis of someof the conceptual foundations of the classical labor the-ory of value. My starting premise is that dynamic mul-tisector models of capitalist competition, in which out-of-equilibrium adjustments occur in real, historical time are anecessary prerequisite to the investigation of issues in thetheory of economic value (see also Fisher (1983, pg. 16)).To this end I outline a macrodynamic model of a hypothet-ical or ideal capitalist economy along classical lines payingparticular attention to Marxs depiction of the formation ofprofit-equalizing prices of production in Volume 3 of Cap-ital, including his distinction between interest income andprofit of enterprise. The model is intentionally simple yetnonetheless attempts to include all the essential phenomenarequired to construct a formal framework in which key is-sues in the classical theory of value can be posed. Althoughmy focus is value theory the macrodynamic model may be ofindependent interest and could be extended and generalizedin various directions.

First, I describe the model and briefly outline some ofits properties including an example of convergence to longperiod equilibrium. Then I apply the model to examinewhat kind of relationship, if any, holds between monetaryphenomena and objective costs, specifically the labor-timerequired to produce commodities.

I. A MULTISECTOR MODEL OF CAPITALISTMACRODYNAMICS

Reproducible commodities as those that may be mul-

tiplied ... almost without any assignable limit, if we aredisposed to bestow the labor necessary to obtain them Ri-cardo (1996). Smith, Ricardo, and Marx argued that mar-ket prices of reproducible commodities tend to gravitate to-ward or around their natural prices (e.g., Smith (1994) ,Book 1, Chapter VII or Marx (1971)). Natural prices arerobust to accidental and temporary deviations (Ricardo,1996) between supply and demand and manifest when quan-tities supplied equal quantities demanded. In the classicalframework market prices are short-term, out-of-equilibrium

a)

Electronic mail: [email protected]; This work is the result of myPhD studies supervised by Andrew Trigg at the Open University. Mythanks to David Zachariah, Allin Cottrell, Fernando Martins, AngeloReati, Anders Ekeland and members of the OPE-L discussion group.

prices formed by imbalances between supply and demandthat get driven by profit-seeking dynamics toward naturalprices, which are long-term equilibrium prices determinedby the objective conditions of production (e.g., see Foley(2008)).

A dynamic approach to the formation of natural pricesrequires modeling out-of-equilibrium adjustment. By con-struction Neoclassical tatonnement or market-clearing as-sumptions cannot explain the outcome of trial-and-errorprocesses that occur in real time. Instead, I follow theclassical cross-dual tradition of formulating general dis-equilibrium models Dumenil and Levy (1987) of economicdynamics over aggregated, multi-firm sectors in which pricesand quantities adjust in tandem and trading occurs at out-of-equilibrium prices (e.g., Dumenil and Levy (1987, 1991)and Flaschel et al. (1997, ch. 2)).

Assumen Z+ sectors that consist of a collection of com-peting firms that specialize in the production of the same

commodity type. The technique is a non-negative n ninput-output matrix of inter-sector coefficients, A = [ai,j ].Each ai,j 0 is the quantity of commodity i directly re-quired to output 1 unit of commodity j. Assume that ma-trix A is fully connected and I A is of full rank. Thereexists a vector xT Rn+ such that x

T > AxT; that is,the technique is productive. The direct labor coefficientsare a 1 n vector, l = [li]. Each li > 0 is the quantity oflabor directly required to output 1 unit of commodityi. As-sume constant returns to scale; A and l are therefore fixedthroughout. Market prices are a 1 n vector p(t) = [pi(t)]and quantities produced (or sectoral activity levels) are a1 n vector q(t) = [qi(t)]. The constant L denotes the size

of the potential labor force and the constant Mdenotes thetotal nominal value of the stock of base money. These arethe only non-reproducible, fixed resources.

I.1. Workers propensity to consume

Money stocks are the only form of savings. The ag-gregate savings of worker households is a stock of moneymw. Workers propensity to consume is a constant frac-tion, w (0, 1], of this sum.1 At any time the aggregate

1 This definition differs from the more familiar Keynesian propensityto consume, which is a flow ratio of consumption to income. In


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expenditure of worker households is therefore wmw.

I.2. The real wage

Marx, in general, assumed a given, subsistence real wagedetermined by the cost of production of workers Marx

(2008). Instead we will assume a fluctuating real wage thatis always sufficient to ensure the reproduction of the avail-able labor force, L. Workers are flexible with regard to thescale of their consumption but not the commodity bundlethey demand. The 1 n real wage vector, w = [wi], has aconstant composition, denoted by the 1 n wage composi-tion vectorw = [wi], but has variable scale; that is w =kwalways for some scale factor k .

The real wage is a function of the aggregate expenditureof worker households,wmw, and the current price of work-ers consumption goods, pwT. The fraction wmw/pwT

denotes the number of real wage bundles of composition wthat can be purchased at money prices p. The real wage is

therefore

w = wmw

pwT wT,

wherek= wmw/pwT is the variable scale factor (compo-sition vector w defines a ray in commodity space that thereal wage traverses). Given a constant aggregate expendi-ture lower (resp. higher) prices imply higher (resp. lower)real consumption.

I.3. Workers savings

The level of employment is lqT. Workers savings, mw,are increased by an inflow of wage payments, lqTw, wherew is the money wage rate, and reduced by an outflow ofconsumption spending, which is the fraction wmw spenton the real wage. The rate of change of total savings is thesum of deposits and withdrawals,

dmwdt

=lqTw wmw. (1)

Hence dmwdt

> 0 indicates active saving and dmwdt

< 0 indi-cates dissaving.

I.4. The wage rate

Marx (2008, pg. 5) states that the money wage rate fluctu-ates with the supply and demand of labor: the same generallaws which regulate the price of commodities in general, nat-urally regulate wages, or the price of labour-power. Wageswill now rise, now fall, according to the relation of supplyand demand, according as competition shapes itself betweenthe buyers of labour-power, the capitalists, and the sellers

this model stocks of money-holdings, which fluctuate according tothe difference between the flow rates of consumption and income,influence the level of consumption.

of labour-power, the workers. To express this I adopt aPhillips-like (1958) description of the labor market such thatthe change in the wage rate depends both on the level of un-employment and the rate of change of unemployment. Thewage rate,w, given a fixed working populationL, varies withthe demand for labor. So an increase (resp. decrease) in the

level of unemployment, ldqT

dt >0 (resp. 0 is a constant elasticity of the wage rate withrespect to unemployment.

I.5. Capitalists propensity to consume

The aggregate savings of capitalist households is a stockof money mc. Capitalists propensity to consume is definedas a constant fraction,c (0, 1], of this sum. The effectivedemand from capitalist households is therefore cmc. Thetotal aggregate expenditure in the economy is the sum ofworker and capitalist expenditure, wmw+cmc.

I.6. Capitalist consumption

Capitalist consumption is specified in a similar way toworker consumption. The fraction cmc/pcT denotes thenumber of bundles of composition c that are purchased atpricesp. Capitalist consumption is therefore

c = cmc

pcT cT,

wherek = cmc/pcT is the variable scale factor.

I.7. A monetary production economy

Marx, in Volume 3 ofCapital, described an abstract spec-ification of the economic relations between capitalists andfirms. He splits the capitalist class into two functional roles:finance capitalists or money-capitalists who lend money atinterest to fund production, and industrial capitalists who,as owners and managers of firms, borrow money to expandproduction in order to gain profit of enterprise.

Money-capital is money lent at interest that creates acreditor-debtor relation. It is this use-value of money ascapital this faculty of producing an average profit whichthe money-capitalist relinquishes to the industrial capitalistfor the period, during which he places the loaned capital at

the latters disposal (Marx, 1971, pg. 351). Money-capitalis not a factor of production in a technical sense but itsavailability and cost act as a constraint since firms need


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firms insector i

capitalist householdsvii. dmc

dt

=ni=1i cmc

as suppliers ofmoney-capital

as owners offirms

vi. net profit from sector ii =pidi mi(qi+ qi)

viii. cmc

iii. revenuepidi

ii. costs of productionmi(qi+ qi)

iv. interest incomemi(qi+ qi)r

i for all i

i. new loansmiqi v. profit of enterprise

i

FIG. 1. Flow of funds between capitalist households and the system of production. Capitalists receive profit income invirtue of two property relations: as suppliers of money-capital they receive interest and as firm owners they are liable for profits andlosses. For the sake of exposition consider a period tduring which sector is level of borrowing alters due to a change in the scale ofproduction, qi qi. (i) If qi > 0 then industrial capitalists borrow miqi new money from finance capitalists; if qi < 0 thenindustrial capitalists repay miqi principal. The total money-capital invested in the sector is nowmi(qi + qi). (ii) Firms spendmi(qi+ qi) on commodity and labor inputs. (iii) Firms produce qi+ qi output and earn revenue pidi from di sales of commodityi. (iv) mi(qi + qi)r interest on the total outstanding debt is paid to finance capitalists. (v) The residual or net income is totalrevenue minus costs, i = pidimiqi(1 + r)miqir. Positive net income, i > 0, is distributed as profit of enterprise to industrialcapitalists; but if net income is negative, i


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This property claim terminates when the loan is repaid. Incontrast, the industrial capitalist, as owner of the firm, isthe residual claimant of the firms net income, and thereforeis liable for both profit and loss after all costs are deductedfrom revenue, including the cost of borrowing money. Thisproperty claim terminates when ownership is transferred orthe firm dissolves. In general, loans are contractually se-

cured such that debt holders are paid before net income isdistributed to firm owners.

In Marxs theory the interest rate is determined in cap-ital markets whereas profit of enterprise is determined bythe conditions of production and the state of the economyas a whole. The interest rate is assumed to be given before-hand, before the process of production begins, hence beforeits result, the gross profit, is achieved (Marx, 1971, pg. 373).Interest payments are anex antecost of production whereasprofit (or loss) is an ex postresidual. Marx (1971, pg. 367)writes that the general rate of profit, therefore, derives ac-tually from causes far different and far more complicatedthan the market rate of interest.

In reality firms finance their production from a wide vari-ety of funding sources, such as short-term overdrafts, loansof different duration with fixed and variable rates of inter-est, and longer-term sources of funds, such as bonds andequity. For analytical simplicity I ignore this complexity.Instead, I represent the aggregate financing of a large num-ber of firms within a sector by a line of credit. Industrialcapitalists continually revise their borrowing requirementsas economic conditions change, thereby altering the aggre-gate level of borrowing. All costs of production (i.e., moniesrequired to pay for inputs prior to the receipt of revenue) areoriginally financed by borrowing. Finance capitalists receiveinterest payments on the money-capital they currently have

tied-up in production on a continuous (daily) basis, at avarying, instantaneous rate of interestr(t), which representsthe current cost of borrowing in the economy.2

Money, at certain points in its circulation, enters thehands of finance capitalists and changes its function frommeans of payment to money-capital. But the amount ofmoney-capital lent to firms is independent of the stock ofmoney in circulation; for example, Marx (1971, pg. 510)writes that Prima facie loan capital always exists in theform of money, later as a claim to money, since the money inwhich it originally exists is now in the hands of the borrowerin actual money-form. For the lender it has been trans-

formed into a claim to money, into a title of ownership. Thesame mass of actual money can, therefore, represent verydifferent masses of money-capital. In this model, the stockof base money is an exogenous constant but the volume ofoutstanding loans to industrial capitalists is an endogenousvariable. The phrase supply of money-capital does not re-fer to an occurrent supply of money but to the provision ofloan services, i.e. the maintenance of a creditor-debtor rela-tionship between finance and industrial capitalists. At thislevel of abstraction banks and fractional reserve banking do

2 In consequence, the circuit of money-capital in this model is perfectlysmooth and lacks the lumpy emergence of distributed stocks offorms of capital. See Foley (1986) for a more concrete approachthat includes distributed time lags in the circuit of capital.

not exist; hence the granting of a loan is an actual transferof base money that creates new debt but does not createnew commercial bank money.

Figure 1 specifies the flow of funds between capitalisthouseholds and the system of production. I now describethese relationships in further detail.

I.8. Profit of enterprise

The revenue generated by sectoriis the total product soldmultiplied by the current price. Demand has two compo-nents: demand from other sectors and demand from house-holds. The demand from other sectors, A(i)q

T, is a functionof the technique and current activity levels. The demandfrom capitalist households is the ith component of capi-talist consumption, (cmc/pcT)ci; and the demand fromworker households is the ith component of the real wage,(wmw/pw

T)wi. The total demand for commodityiis then

di= A

(i)qT +

cmc

pcT ci+

wmw

pwT w

i

and hence total revenue for sector i is pidi.The total costs incurred by sectori during the production

ofqi is the quantity of inputs bought in the market multi-plied by their respective prices. Cost also has two compo-nents: input costs and the interest charged on loans.

The cost of input commodities, pA(i)qi, is a function ofthe technique, commodity prices and the activity level. Thewage cost,liqiw, is a function of the direct labor coefficient,the wage rate and the activity level. The unit cost of pro-duction, excluding the cost of borrowing, is therefore

mi = pA(i) +liw.

Vickers (1987) analyzes the capital structure of firms, inparticular the partial financing of production by debt cap-ital. He defines money capital requirement coefficients asthe amount of money-capital required to finance a unit offactor capacity. In an economy with pure circulating cap-ital and production entirely financed by borrowing the unitcosts mi are also money capital requirement coefficients,measured in units of nominal debt per unit output, Coef-ficients mi therefore denote the amount of money-capitalcurrently required to finance unit output of commodity i.

The current cost of borrowing 1 unit of money is r unitsof money, where the interest rate r is the price of money-capital. The total money-capital required to produce at thecurrent scale of production, or outstanding debt, is miqi.The interest charged on miqi money-capital is simply thisquantity multiplied by its price, miqir. So the total cost ofproduction in sector i, including the cost of borrowing, ismiqi(1 +r).

We can now construct a profit function. The currentprofit (or loss) in sector i is the difference between totalrevenue and total cost; that is

i = pidi miqi(1 +r). (3)

I.9. Capitalist savings

Capitalists savings, mc, which consist of the aggregatemoney holdings of finance and industrial capitalists, are aug-


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mented by an inflow of profit consisting of total interestincome,mqTr, and total entrepreneurial profits (or losses),n

i=1i and are reduced by an outflow of consumptionspending, which is the fraction of savings, cmc spent onthe consumption bundle c. The change in savings is thesum of income minus expenditure; that is,

dmcdt = (pA + lw)qTr cmc+

ni=1

i, (4)

Profit of enterprise,n

i=1i, may vary in sign and thereforerepresent either a profit inflow (from firms to industrial capi-talists) or a loss-covering outflow (from industrial capitaliststo firms).

I.10. The interest rate

Marx, in his unfinished notes published as Volume 3 ofCapital, sketches an incomplete loanable funds theory of the

rate of interest. As concerns the perpetually fluctuatingmarket rate of interest, however, it exists at any moment asa fixed magnitude, just as the market-price of commodities,because in the money-market all loanable capital continuallyfaces functioning capital as an aggregate mass, so that therelation between the supply of loanable capital on one side,and the demand for it on the other, decides the market levelof interest at any given time (Marx, 1971, pg. 366).

Money-capital is both like and unlike other commodities:interest-bearing capital, although a category which differsabsolutely from a commodity, becomes a commodity suigeneris, so that interest becomes its price, fixed at all timesby supply and demand like the market-price of an ordinary

commodity. (Marx, 1971, pg. 366). Money-capital is notproduced and hence its price is regulated solely by supplyand demand and not by a cost of production. In conse-quence, there is rather no law of division [between financecapitalists and industrial capitalists] except that enforced bycompetition, because ... no such thing as a natural rateof interest exists (Marx, 1971, pg. 365). In Marxs view anatural price is a property of production and therefore in-dependent of competition in the market. So although theinterest rate is the market price of money-capital it simplylacks a corresponding natural price to gravitate toward.

In this model the total stock of loanable funds available tofinance production is the stock of base money held by capi-

talists. Individual capitalists may both lend and borrow andtherefore can function as their own lenders. I abstract fromthe labor and wages of money management and investment(i.e., financial costs of production). Individual capitalistsmanage subsets of the total stock of loanable funds, whichare subject to fluctuations: for example industrial capital-ists experience both profit and loss. Such micro-level fluc-tuations alter the distribution of loanable funds within thecapitalist class. But in the aggregate the net change in thestock of loanable funds depends only on the class distribu-tion of savings.

Assume that an individual finance capitalists willingnessto lend depends on the current stock of loanable funds at

their disposal. Finance capitalists therefore tend to raisethe cost of borrowing when their stocks of funds decreasebecause industrial capitalists tend to outbid each other when

competing to buy the reduced supply of loans; conversely,finance capitalists tend to lower the cost of borrowing whentheir stocks of funds increase because they tend to underbideach other when competing to sell the increased supply ofloans to industrial capitalists. Given these assumptions therelative change in the interest rate is negatively proportionalto the relative change in the total amount of loanable funds;

that is,dr

dt = c

1

mc

dmcdt

r, (5)

where c > 0 is a constant elasticity of the interest ratewith respect to the stock of loanable funds. Equation (5)has a cross-dual form: a change in the quantity of loanablefunds causes a corresponding change in the price of money-capital. In consequence the interest rate varies with thescarcity (or abundance) of the total stock of loanable funds.But this behavioral relationship should not be taken at facevalue. Money-capital is not produced. The stock of fundsturns over multiple times to support very different masses ofmoney-capital. Money-capital need not be saved up beforeit can be used up. Any level of demand for loans, at thegiven interest rate, can in principle be supplied regardlessof the stock of funds. So money-capital is scarce in virtueof its use not its nature.

I.11. Inventory stocks

The supply of commodity i will not in general equal thereal demand for it, that is qi = di. Each sector stores astock of unsold inventories, denoted si. When supply is

greater than (resp. less than) demand then inventories in-crease (resp. decrease). The rate of change of inventoriesis therefore equal to the excess supply, dsi

dt =qi di; or, in

full,

dsidt

=qi (A(i)qT +

cmcpcT

ci+wmw

pwT wi). (6)

Assume that commodities are imperishable so unsold inven-tories can be stored indefinitely.3

I.12. Cross-dual price adjustment

A sectors overall price and quantity adjustment is theaggregate of the adjustments of the individual firms thatcomprise it. An excess or lack of demand for a commod-ity translates into a change in the size of inventories. Forexample, underproduction relative to demand means thatinventories shrink, whereas overproduction means that in-ventories grow. Firms tend to raise prices when invento-ries shrink on the assumption that buyers will outbid each

3 A more general model would allow inventories to be destroyed ac-cording to a per sector decay rate. Then the inventory held by ser-vice sectors could be interpreted as short-term excess capacity, forexample due to the ability of service providers to store intermediateproducts and work with greater intensity.


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6

other to obtain the scarce product, whereas firms tend tolower prices when inventories grow on the assumption thatother firms will underbid each other in order to sell to scarcebuyers. The sector as a whole, therefore, adjusts the rela-tive price of its commodity in proportion to excess demand,that is 1pi

dpidt

dsidt . This has a cross-dual form: a quan-

tity imbalance, represented by the change in inventory size,

translates into a price adjustment.Assume that the change in price approaches positive asinventory approaches zero and the commodity is completelyscarce, that is 1pi

dpidt

1si

. Combining these two factors we

get the price adjustment equation

dpidt

= idsidt

pisi

, (7)

wherei > 0 is a constant elasticity of price with respect toexcess supply. Sectors with small (resp. large) inventorieswill tend to adjust prices relatively quickly (resp. slowly). Iassume that firms do not reduce prices to dump inventoryand realize value but instead maintain an inventory buffer

to manage any variance in excess demand.

I.13. Cross-dual quantity adjustment

Industrial capitalists, as owners and managers of firms,adjust their production plans based on profits and losses. Afirm that returns a profit (resp. loss) borrows more (resp.less) money in order to increase (resp. decrease) supply withthe expectation of earning greater profit (resp. reducinglosses).

Industrial capitalists, as a whole, own a portfolio of firmsgrouped into sectors that, at any time, make different profitsor losses. The costs of production in sector i, includingpayment of interest on money-capital, is miqi(1 + r). Theratio of total profit to costs of production,

imiqi(1 +r)

,

is the profit rate, which we can interpret as the expected in-crease of profit of enterprise from 1 unit of additional invest-ment of money in sectori ceteris paribus. Capitalists aim tomaximize their profit by differentially injecting or withdraw-ing money investments based on these profit-rate signals.The relative change in the scale of production is therefore

proportional to the profit rate, that is 1

qi

dqidt

imiqi(1+r) .

This has a cross-dual form: a price imbalance, representedby the profit rate, translates into a quantity adjustment. Inconsequence, we get the quantity adjustment equation

dqidt

=n+ii

mi(1 +r), (8)

wheren+i > 0 is a constant elasticity of supply with respectto profit. Sectors with a high (resp. low) profit rate increase(resp. decrease) their borrowing in order to increase (resp.decrease) the supply of goods to the market.

We can also interpret quantity adjustment equation (8)in terms of the rate of return,

ri =pidi miqi

miqi,

which is the expected return from 1 unit of additional in-vestment of money in sector i prior to its distribution asinterest income and profit of enterprise. An equivalent ex-pression for quantity adjustment, in terms of the rate ofreturn, is then

dqidt

=n+iqi

1 +r(ri r) (9)

(ri r).

Industrial capitalists compare the expected return from in-vesting additional money in production, ri, with the inter-est rate, r. Ifri > r then additional money is productivelyinvested and supply expands; ifri < r then money is with-drawn from production and supply decreases. Industrialcapitalists expand production if the rate of return is greaterthan the cost of borrowing. The demand for credit from in-dustrial capitalists therefore varies with the rate of return.

This completes the phenomenological description of themodel. Next we will examine some of its properties.

II. MARKET PRICES AND SCARCITY

Solve price adjustment equation (7) to obtain marketprices as a function of inventory levels; that is,

pi(t) =pi0sii0

1

si(t)i(10)

for all i (the subscript 0 indicates the value of the variableat time zero). A high market price indicates low inventory.An obvious and natural interpretation of this relationship isthat market prices measure the relative scarcity (or abun-dance) of a commodity.

Solve wage adjustment equation (2) to give the wage rateas a function of the level of employment,

w(t) =kw1

(L lqT)w, (11)

where

kw =w0(L lqT0

)w

is a positive constant. The wage rate indicates the scarcityof unemployed labor available for hire.

Solve interest rate adjustment equation (5) to give theinterest rate as a function of the quantity of loanable funds,

r(t) =r0

mcc01

mcc. (12)

The interest rate is also a market price that indicatesscarcity, in this case the scarcity of loanable funds. As thestock of loanable funds decreases the interest rate rises.

III. CONSERVATION OF THE MONEY STOCK

Aggregate expenditure, wmw+ cmc, varies dependingon the distribution of savings between workers and capital-ists. Since firms do not hold money stocks the aggregate ex-

penditure must return to households as income in the formof wages, interest or profit. The sum of savings,mw+ mc,is therefore always equal to the fixed stock of base money.


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workersavings mw

capitalistsavings mc

system of productioni

i. wmw

ii. cmc

iii. lqTw

iv. mqTr

v.

i

FIG. 2. Aggregate profit of enterprise as an aggregate

residual income. The total aggregate expenditure in theeconomy consists of spending from (i) workers and (ii) capi-talists. The aggregate expenditure is exchanged for goods andservices supplied by firms. Firms payout (iii) total wages and(iv) total interest payments, which are ex ante liabilities. Themismatch between aggregate expenditure and firm liabilities is(v) the total profit of enterprise, which is an ex post resid-ual distributed to firm owners. Total profit is therefore pos-itive (resp. negative) only if aggregate expenditure is greaterthan (resp. less than) total wage and interest income; that is,

i = (wmw+ cmc) (lqTw+ mqTr).

Lemma 1. Total savings, M, are constant,M=mw(t) +mc(t)

=mw0

+mc0

.

Proof. Sum equations (3) to get

ni=1

i = wmw+cmc lqTw (pA + lw)qTr. (13)

Sum equations (1) and (4) to get

dmwdt

+dmc

dt = wmw cmc+ (14)

lqTw+ (pA + lw)qTr+ni=1

i.

Substitute (13) into (14) to get dmwdt + dmcdt = 0. Hence

mw(t) + mc(t) =k, wherek is a constant of integration. Att= 0 we have k = mw

0+mc

0.

A key conclusion is the existence of a direct trade-off be-tween workers and capitalists over ownership of the stockof money wealth in the economy. What one class gains the

other must lose. So although total household spending al-ways returns as income it nonetheless transfers from oneclass to another during its circulation.

Equation (13) is a macroeconomic money conservationequation, which relates aggregate expenditure and total in-come. Figure 2 depicts the relationship. Total householdspending and total wage and interest income are in generalunequal. The difference is profit of enterprise.

Simplify further and assume zero interest income, i.e.r0

= 0. Then (13) isn

i=1i =wmw+ cmc lqTw. So

total profit of enterprise is positive if total spending exceedsthe total wage bill. If workers spend what they earn thentotal profit is realized entirely by capitalist consumption (In

point of fact, paradoxical as it may seem at the first glance,the capitalist class itself casts into circulation the moneythat serves towards the realisation of the surplus-value con-tained in its commodities (Marx, 1974, Ch. 17) and seealso Trigg (2002)). In such circumstances sector-level lossesrepresent transfers within the capitalist class.4

IV. A NUMERICAL EXAMPLE

What dynamics does this model generate?Consider the following example of a small, 3-sector econ-

omy that produces corn, iron and sugar, with parameters

A=

0.2 0 0.40.2 0.8 0

0 0 0.1

,

l = [0.7, 0.6, 0.3], w = [0.6, 0, 0.2] (workers consume cornand sugar but not iron), c = [0.2, 0, 0.4] (capitalists propor-tionally consume more sugar than corn compared to work-ers), p

0 = [1, 0.8, 0.5], q

0 = [0.01, 0.1, 0.1] (the initial sup-

ply of corn is relatively low), s0

= [0.01, 0.1, 0.25] (the ini-tial stock of corn is relatively low), w

0 = 0.5, r

0 = 0.03,

mw0 =mc0 = 0.5 (worker and capitalist savings are initially

equal and the total money stock in the economy is M= 1),w = 0.8 andc = 0.7 (workers have a higher propensity toconsume),L = 1, the price elasticities are 1= 2= 3= 2,the quantity elasticities are 4 = 5 = 6 = 1, the wage isrelatively inelastic, w = 0.25, and the interest rate rela-tively elastic, c = 2. These parameters generate an econ-omy that follows a growth trajectory until it reaches a realand monetary, self-replacing equilibrium.

4 This model supports Keens point (Keen, 2010) that a fixed stockof base money turns over multiple times to support variable incomeflows in excess of that stock. The so-called paradox of monetaryprofit in the Circuitist approach Graziani (2003) disappears oncesufficient attention is paid to the dynamic relationships betweenstocks and flows.


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8

0 5 10 15 20 25

0.2

0.4

0.6

0.8

1.0

t

lqT,

L

(a)Employment, lqT and population, L = 1.

0 5 10 15 20 25

0.50

0.55

0.60

0.65

0.70

t

w

(b)Wage rate, w .

0 5 10 15 20 25

0.0

0.1

0.2

0.3

t

liqi

(c)Sectoral employment, liqi.

0 5 10 15 20 25

0.73

0.74

0.75

0.76

0.77

t

mcc

mw

w

(d)Aggregate expenditure, wmw+ cmc.

0 5 10 15 20 25

0.0

0.1

0.2

0.3

0.4

0.5

t

wmw

pw

Twi

wmc

pc

Tci

(e)Real demand, mwpwT

wi+ mc

pcTci.

0 5 10 15 20 25

0.00

0.05

0.10

0.15

0.20

0.25

t

si

(f)Inventories,s .

0 5 10 15 20 25

0

50

100

150

t

pi

(g)Prices,p.

0 5 10 15 20 25

0.0

0.1

0.2

0.3

0.4

0.5

t

qi

(h)Quantitiesq .

0 5 10 15 20 25

0.3

0.4

0.5

0.6

0.7

t

mw,mc

(i)Worker savings,mw (black), and capitalistsavings, mc (dashed).

0 5 10 15 20 25

6

4

2

0

2

4

6

8

t

i

(j)Profit of enterprise, i.

0 5 10 15 20 25

0.0

0.2

0.4

0.6

t

i

(k)Total profit of enterprise,

3i=1i.

0 5 10 15 20 25

0.02

0.03

0.04

0.05

0.06

0.07

0.08

t

r

(l)Interest rate, r .

5 10 15 20 25

1

0

1

2

3

t

rir

0. 05 0 .10 0. 15 0 .20 0. 25

20

40

60

80

(m)Rate of return minus the interest rate,

ri r. Main graph: 0.32 t 25; inset:0 t 0.32 (the return in the corn sector isvery high).

0 5 10 15 20 25

0

10

20

30

40

t

mqT

(n)Main graph: money-capital tied up in

production, or total outstanding debt,mqT

.

0 5 10 15 20 25

0.0

0.2

0.4

0.6

t

(o)The distribution of income. Wages: black,

interest: dashed, profit: gray.

FIG. 3. A numerical example of convergence to equilibrium.Note: this economy follows a profit-led growth trajectory until it reaches a self-replacing equilibrium. Sectors: corn (black), iron(dashed), sugar (gray).


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9

The scale of real demand from households depends on ag-gregate expenditure and the current price structure. In thisexample the employment level rises (see Figure 3(a)) be-cause in general real demand outstrips the capacity of theeconomy to supply commodities in the required amounts(e.g., Figure 3(f) graphs the inventory stock, which initiallydepletes to satisfy the excess demand). More workers are

required to meet the demand, which causes a correspond-ing increase in the wage rate, shown in Figure 3(b). Thedivision of labor adapts (see Figure 3(c)) until in equilib-rium the scale and composition of the net product equalsreal demand, at which point inventory stocks stabilize.

Total household spending initially falls then at t 5steadily climbs to its maximum (see Figure 3(d)). Workershave a higher propensity to consume compared to capital-ists. So the two demand regimes correspond to shifts in thedistribution of money wealth between the two classes (seeFigure 3(i)). Total spending always returns as income, ei-ther in the form of wages, interest or profit. So the stock ofmoney is conserved and the trajectory of capitalist savings

exactly mirrors worker savings.Real demand hits two lows prior tot 5 (see Figure 3(e))caused by relatively low total household spending and twodramatic price spikes (see Figure 3(g)) that function to ra-tion temporarily scarce commodities (corn and iron). Butsupply adjusts, consumer inflation dissipates, and aftert 5real demand steadily rises.

Expansion of output is profit-led. Figure 3(k) plots thetotal profit of enterprise. In general, total profit is eitherpositive during gravitation or close to zero near equilibrium.The exception is a short period at t 3 where losses in thecorn and sugar sectors outweigh profit in the iron sector (seeFigure 3(j)).

Firms sell inventory to satisfy excess demand. Low inven-tory causes price spikes. Price spikes tend to raise sectoralprofits (compare the price spikes, graphed in Figure 3(g),with profit of enterprise, graphed in Figure 3(j)). Industrialcapitalists can therefore gain a higher return than the costof borrowing and invest in production (see Figure 3(m), es-pecially the initial high return in the corn sector). The newfunds are used to increase the scale of production (see Fig-ure 3(h), especially the initial high growth in the corn sec-tor). Figure 3(j) plots total profits per sector, which initiallyexhibit wide fluctuations, indicating differential returns onmoney invested, until settling to a uniform zero profit rateat equilibrium, at which point activity levels are stable (Fig-

ure 3(h)).Figure 3(l) graphs the interest rate, which fluctuates with

the total stock of loanable funds (see inset of figure 3(n)).Figure 3(n) graphs total loans advanced, which is sensitiveto the price structure and the scale of production. Totalinterest income is a function of the volume of lending andthe interest rate. So, for instance, the high price of iron att 3 increases costs of production and therefore the volumeof borrowing, which results in more interest income for ren-tiers (Figure 3(o)). In the same period profit of enterprisefalls (Figure 3(o)). Why is this? Given a level of total house-hold spending a dramatic spike in interest income means lessincome in the form of profit and wages. Industrial capital-

ists are subject to a cost-push profit squeeze, which at rootderives from the relative scarcity of real-capital, specificallyiron. The high costs of production throttle growth (see Fig-

ure 3(h) att 3). But this contraction is temporary. Laborand real-capital is reallocated to iron production, which in-creases supply, lowering its price and therefore costs of pro-duction in general. The volume of lending falls and profitsof enterprise recover.

This single example is indicative but does not exhaust therange of dynamics the model generates.

V. STABILITY OF LONG-PERIOD EQUILIBRIUM

Numerical simulations indicate that the equilibrium is lo-cally asymptotically stable. So economies in the domain ofattraction of the long-period position gravitate toward it.But a proof of local stability for this model is an outstand-ing problem. So this statement remains a conjecture fornow. A special-case of this model, with a simpler quantityadjustment function and zero interest income, is provablylocally stable. But the specific proof is not entirely satis-fying since it utilizes vector Lyapunov functions, which do

not yield a straightforward economic interpretation Wright(2010).Some authors (e.g., Bellino (1997)) observe that existing

pure cross-dual models are unstable and lack convergenceproperties. But such conclusions are premature since thefull range of pure cross-dual models has yet to be explored.For instance, I have simulated many qualitatively differentbut close variants of this model. The numerical simulationsindicate that all these variants are locally stable. I expect,therefore, that a general proof of local stability, applicableto a wide class of cross-dual models, can be found.

The coordination of millions of independent productionactivities in a large-scale market economy is neither perfect

or equitable but nonetheless one should be far more sur-prised by the existing degree of coordination than by the el-ements of disorder (Boggio, 1995). The model developed inthis paper, notwithstanding the theoretical simplifications,is a powerful example that the classical cross-dual theoryof competition can be formalized to provide a coherent andsuccessful explanation of the homeostatic kernel of general-ized commodity production.

Next we examine some of the properties of the economicequilibrium.

VI. THE NATURAL PRICE EQUILIBRIUM

I restrict the analysis to D = {[p(t), q(t), mc(t)] R2n+1

+ :

lqT(t)< L}, i.e. economically relevant equilibria.

VI.1. Zero profit of enterprise

Activity levels adjust according to profit rate differen-tials. By definition activity levels are constant in equilib-rium. Hence in equilibrium profit of enterprise is uniformlyzero and there is no incentive to reallocate capital.

Lemma 2. Profits are zero in equilibrium, i = 0 for all i.

Proof. Substitute dqidt

= 0 into quantity adjustment equation(8) to get i = 0 for all i.


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10

Profit of enterprise is a disequilibrium phenomenon de-riving from imbalances between supply and demand. Profitrepresents an arbitrage opportunity that attracts capital.But the scramble for profit has the unintended consequenceof reducing imbalances between supply and demand, whicheliminates arbitrage opportunities and causes the rate ofprofit to fall. In equilibrium supply and demand are exactly

equal and profit of enterprise is zero.The zero profit condition is equivalent to the equality ofthe rate of return and the interest rate.

Lemma 3. The equilibrium rate of return in all sectorsequals the equilibrium interest rate, ri =r

for all i.

Proof. Substitute dqidt

= 0 into quantity adjustment equation(9) to get ri =r

for all i.

In equilibrium, the rate of return is uniform across sectorsand equal to the interest rate. The equilibrium price struc-ture does not provide an incentive for industrial capitaliststo alter their production plans. In reality, of course, other

sources of anticipated reward or loss, not included in thismodel, motivate capitalists to change the scale of produc-tion.

VI.2. Total income equals aggregate expenditure

Money conservation identity (13) implies that total house-hold spending always returns either in the form of wage in-come, interest or profit. Since profit of enterprise is zeroin equilibrium the total income must consist of wages andinterest.

Lemma 4. Equilibrium total income is total wages andinterest income, which equals the equilibrium aggregate ex-penditure:

lqTw + mqTr =wm

w+cm

c .

Proof. By Lemma 2, i = 0 for all i. Substitute the zeroprofit condition into equation (13).

Out-of-equilibrium the aggregate demand may transferfrom one class to another during its circulation. Equilib-rium is simpler: no transfer occurs and both workers andcapitalists earn what they spend.

Lemma 5. In equilibrium workers earn what they spend,

lqTw =wm

w

Proof. Set dmwdt

= 0 in equation (1).

Lemma 6. In equilibrium capitalists earn what they spend,

mqTr =cm

c

Proof. Set dmcdt = 0 in equation (4) and use the zero profitcondition of Lemma 2 to yield the conclusion.

These properties are an instance of Kaleckis aphorism(Kalecki, 1954, Ch. 3) that capitalists earn what they spend

while workers spend what they earn (Trigg, 2006, Ch. 3).Kaleckis aphorism holds in equilibrium but not out-of-equilibrium when workers saving may be non-zero.

VI.3. A positive rate of interest

Interest income, unlike profit of enterprise, is an ex antecost of production not an ex post residual. There are nocircumstances in which it can be eliminated given the in-stitutional arrangements of capitalist production. In conse-quence, the interest rate is always positive in equilibrium.

Lemma 7. Positive equilibrium capitalist savings, mc >0,imply a positive equilibrium interest rate,r >0.

Proof. Equation (12) and mc >0 implies r >0.

Profit rates are not the price of any particular thing. Butin equilibrium the interest rate, or price of money-capital,is the price of a particular bundle of commodities.

Lemma 8. The equilibrium interest rate is the cost of cap-italist consumption per unit of money-capital supplied toproduction,

r =pcT, (15)

where

cT = 1

mqTcm

c

pcTcT

is the vector of capitalist consumption divided by the totalvolume of borrowing.

Proof. Equilibrium capitalist consumption is(cmc/p

cT)cT. Divide by the total borrowing, mqT,to get the the rate of capitalist consumption per unit ofmoney-capital,cT. Then

p

c

T = cm

cmqT . (16)

Lemma 6 equates total interest income to capitalist expen-diture, cmc = m

qTr. Substitute into (16) and the con-clusion follows.

In section I.10 we noted that Marx rejected the existenceof a natural rate of interest on the grounds that money-capital, unlike a reproducible commodity such as corn, lacksa cost of production; hence its price is simply a market priceset by competition.

In equilibrium the interest rate does not have a naturalrate defined in terms of a technical cost of production. But

in equilibrium this price of money-capital corresponds tothe cost of production of a composite commodity, specifi-cally capitalist consumption per unit of money-capital tied-up in production. Although the trajectory of the interestrate is controlled by non-technical, conventional factors,such as the interest rate elasticity and the stock of loan-able funds, nonetheless it is both law-governed and causallyconnected to a real cost of production.

VI.4. Positive inventories

Stored inventories do not decay. Firms do not attempt

to reduce their absolute level of inventory but only modifytheir prices in response to relative changes in inventory. Inconsequence, inventories are positive in equilibrium.


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11

Lemma 9. Positive equilibrium prices, p >0, imply pos-itive equilibrium stocks of inventory, s >0.

Proof. Equation (10) and pi >0 implies s

i >0.

VI.5. Involuntary unemployment

Lemma 10. A positive equilibrium wage, w > 0, impliespositive unemployment, 0< lqT < L.

Proof. Equation (11) implies,

L lqT =k1/ww

1

w

1/w.

Ifw > 0 then the RHS of this equation is positive; henceL lqT >0 and the conclusion follows.

Market adjustment, including the pooling and lending ofloanable funds does not, by itself, guarantee full employ-

ment. In equilibrium labor is efficiently allocated betweenthe different sectors of production but the economy in gen-eral does not operate at full capacity.

VI.6. Prices of production

Proposition 1. Equilibrium prices in terms of the equilib-rium wage, w, and interest rate, r, are

p = (pA + lw)(1 +r), (17)

where

w =kw1

(L lqT)w

r =r0

mcc01

(M mw)c

. (18)

Proof. The zero profit condition of Lemma 2 implies

pi (A(i)qT+

cm

c

pcTci+

wm

w

pwTwi) =

qi(pA(i) +liw

)(1 +r). (19)

Set dsidt

= 0 in equation (6) to get

qi =A(i)qT +

cmcpcT

ci+wmw

pwTwi. (20)

Substitute the RHS of (20) into (19) to get pi q

i =qi(p

A(i)+ liw)(1+r). Simplify, write in vector form and

use expressions (11) and (12) to yield the conclusion.

Equation (17) is structurally equivalent to the standardequation for profit-equalizing prices of production withwages paid ex ante (i.e., advanced by capitalists) stud-ied extensively in static, linear production theory (e.g., seePasinetti (1977); Kurz and Salvadori (1995); Abraham-Frois

and Berrebi (1997) etc.) This dynamic model therefore em-beds the linear production price model as a special case atequilibrium.

Equation (17) has two unknowns, the equilibrium wageand profit rate. In linear production theory the two un-knowns are fixed by specifying a normalization condition,an arbitrarynumeraire, and a distributional variable, eitherthe wage or profit rate. But the formal theory itself doesnot determine absolute prices and the distribution of income(e.g., Sraffa (1960)). This dynamic model includes money

and a theory of the distribution of income, specifically howwages and profits interact through time. In consequencewhen we fully characterize the equilibrium of the systembelow we also determine absolute prices and the distribu-tion of income without reference to an arbitrarily chosennumeraire.

In equilibrium costs and revenues balance in all sectorsand the same uniform rate of gross profit prevails. Thisprofit however consists entirely of interest income. Profit ofenterprise, in this deterministic model, is a disequilibriumphenomenon and therefore is almost always non-uniform.The uniform profit rate in equilibrium interpretations oflinear production systems should be interpreted as an ex

anteuniform rate of interest that prevails in financial mar-kets, and therefore a cost of production, and not an ex postprofit or surplus generated at the level of enterprises. Thispoint-of-view is consistent with Farjoun and Machovers(1989) critique that the assumption of uniform profits inlinear production theory is empirically false.

VI.7. Equality of the net product and final demand

Proposition 2. Equilibrium quantities in terms of the equi-librium net product, n =w + c, are

q

=n

(I AT

)1

(21)

where

w = wm

w

pwTw

is the equilibrium real wage and

c = cm

c

pcTc=

c(M m

w)

pcT c

is the equilibrium real consumption of capitalists.

Proof. Set dsidt

= 0 in equation (6) to get

qi =A(i)qT +

cm

c

pcTci+

wm

w

pwTwi. (22)

Use Lemma 1, write in vector form and rearrange to yieldthe conclusion.

Equation (21) can be written as q = qAT +n. In-terpret this equation as stating that the equilibrium scale ofproduction consists of the collection of commodities used-upas means of production,qAT (the circulating real-capital),and the net product, n, which is final consumption. Theequilibrium activity levels in the economy are therefore de-

termined by the current technique and the composition andscale of final consumption. Final consumption, however, isitself determined by aggregate monetary demand and the


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12

prevailing price structure. The real and the monetary as-pects of the economy are intertwined.

Equation (21) is also identical to a standard linear produc-tion equation of circulating capital (e.g., see the discussionof the open Leontief system in Pasinetti (1977, Ch. 4)). Sothis dynamic system embeds the complete linear productionmodel at its equilibrium point.

VI.8. The long-period position: a monetary equilibrium

The long-period position that is equilibrium prices,quantities and the distribution of savings is defined by asystem of nonlinear simultaneous equations. Aside from spe-cial cases the system requires numerical methods to solve.Nonetheless the qualitative structure of the equations hassome salient features. I briefly sketch some of them andtheir implications.

Corollary 11. The 2n+1 unknowns equilibrium absolute

prices, p, quantities, q, and the distribution of savings,represented by savings mw are jointly determined by thefollowing 2n+1 system of nonlinear simultaneous equations,

p =

pA + (

wmwlqT

)l

(1 +r) (23)

q =qAT +wm

w

pwTw +

c(M m

w)

pcT c (24)

mw = kww

lqT

(L lqT)w, (25)

where constantkw =w0(L lqT0

)w andr is a function of

mw as specified by equation (18).

Proof. Equilibrium prices are given by Proposition 1. ByProposition 5 the equilibrium wage rate, w, can be re-placed by wmw/lq

T. The equilibrium interest rate, r,can be replaced by a function of equilibrium worker savings(equation (18)). These replacements yield equation (23).Equation (24) is given directly by Proposition 2. Lemma 5gives equilibrium worker savings as mw =

1w

lqTw. Use

equation (11) to replace the equilibrium wage rate by a func-tion of the equilibrium level of employment to yield equation(25).

Equation system (23,24,25) implicitly defines the long-period position. Prices, activity levels and the distributionof income are all interrelated.

The long-period position is differentially sensitive to theinitial conditions in the economy. For example, the equi-librium is entirely independent of initial prices, p

0, and

initial inventory levels, s0

. As might be expected, out-of-equilibrium scarcity prices of reproducible commodities turnout to be irrelevant not only to the determination of equilib-rium prices but any aspect of the long-period position. Sostable economies differentiated only by their market pricesand initial stocks of inventory all converge to the same eco-

nomic state. Market prices are therefore transient phenom-ena that affect the path the economy takes to equilibriumbut not the equilibrium itself.

Corollary 12. Equilibrium workers savings, mw, are im-plicitly defined by

mw = 1

w

1

1 +rl(I A)1

wm

w

dwT wT +

cm

c

dcT cT

,

whered = l[I A(1 + r)]1. mw is therefore a function ofconstantsA, l, w, c, c, w, c and a subset of the initialconditions,mw0 , mc0 and r0 .

Proof. Proposition 1 implies

p =l(I A(1 +r))1w(1 +r) =dw(1 +r). (26)

Proposition 2 implies

q =

wmwpwT

w +cmcpcT

c

(I AT)1. (27)

Substitute (26) into (27) and pre-multiply both sides bydirect labor coefficients l to yield the scalar equation,

lqTw = 11 +r

l(I A)1

wmwdwT

wT + cmc

dcT cT

.

From Proposition 5, lqTw =wmw.

Corollary 12 implies that for a given technique, [A, l],and composition of demand, w and c the equilibrium classdistribution of savings, represented by mw, and thereforethe equilibrium income distribution and aggregate expendi-ture, are entirely independent of market prices, the scale ofproduction and the dynamics of the labor market. Incomeshares are instead determined by a set of nominal factors,which we shall call monetary factors, specifically propensi-

ties to consume, the initial distribution of savings, and theinterest rate policy, represented by r

0and elasticity c. So

convergent economies with the same monetary factors allconverge to the same nominal income distribution. Incomeshares are therefore insensitive to a wide range of economicdisturbances, such as market prices, activity levels and labormarket conditions. This result is suggestive since the rela-tive stability of income shares is a notable feature of actualcapitalist economies (Foley and Michl, 1999).

The total wage bill,lqTw, or equivalently the aggregateexpenditure of workers, is fixed by monetary factors. Theconditions in the labor market for instance wage elasticityw then determine the wage rate and level of employment

consistent with this level of expenditure.The long-period position has a Sraffian structure. Equi-

librium prices depend on income shares (and not the otherway around). Income shares are fixed primarily by thedynamics of the interest rate. Sraffa (1960) suggestedthat price equation (17) might be closed by the level ofthe money rates of interest. The supply of homogeneousmoney-capital is distinguished from the supply of hetero-geneous physical capital; hence the model avoids the con-ceptual errors exposed by the Cambridge capital critique(Cohen and Harcourt, 2003).

This model shares commonalities with Post Keynesian ap-proaches (Rogers, 1989, Ch. 7); for example, money is not

neutral but has real effects; the interest rate is a conven-tional or exogenous variable that lacks a natural rate; thesupply of credit is endogenous and not constrained by the


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13

money supply; and the long-period equilibrium is deter-mined by the principle of effective demand, such that thereis a limit to the profitable expansion of output (Chick,1983, pg. 71) before full employment is reached. Many au-thors have noted that Keynes vision of a capitalist econ-omy as a monetary production economy is along many di-mensions consistent with Marxs analysis (e.g., (Reati, 2000;

Hein, 2009; Rogers, 1989; Smithin, 2009)).

VII. NATURAL PRICES AND OBJECTIVE COSTS

We will now use the model to address a foundational ques-tion in the theory of economic value.

As production is reorganized to meet final demand thelink between market prices and scarcity is dissipated. Inlong-period equilibrium relative natural prices are indepen-dent of initial endowments and the composition of demandand are instead determined by the technique and the dis-tribution of income (see Proposition 1). Scarcity does not

explain equilibrium prices. What cost principle, then, aremarket prices attracted toward?

The answer is simple and both dissonant and consonantwith the classical labor theory of value: prices of productionare proportional to total labor costs. But to be able to givethis answer first requires clarity and precision about themeaning of total labor costs.

VII.1. Labor-values in a worker-only economy

This model includes a dynamic worker-only economy asa special-case by setting c = 0 and r0 = 0, which re-

moves capitalist demand and interest income, and settingdmwdt

= lqTw wmw + dmcdt

= lqTw wmw +

i,which distributes profit of enterprise to worker households(which we can interpret as local profit sharing in worker-owned firms or as a global social dividend).

Figure 4 depicts an example social accounting matrix for aworker-only economy, which produces corn, iron and sugar.The real wage coefficients, wi(t), which are commodity in-puts to labor households per unit of labor supplied, are then

w(t) = 1

lqTwmw

pwT wT = [ wi(t)],

which vary in time. Coefficients wi(t) synchronize the con-sumption of the real wage with the supply of labor; they donot imply that the consumption of the real wage is neces-sarily funded by the wages of that labor (e.g., workers maybe dissaving).

The social accounting matrix immediately tells us thatliunits of labor are directly required to produce commodityi. But we can also calculate the total labor required to re-produce commodityi; that is, the total labor, operating notjust in one sector but in parallel in the economy as a whole,supplied simultaneously to output 1 unit of commodity iand replace all the indirect commodity inputs used-up dur-ing its production. Marx, following the Ricardian socialist,

Thomas Hodgskin (Hodgskin, 1825; Perelman, 1987), on oc-casion referred to this concept as coexisting labor: [Raw]cotton, yarn, fabric, are not only produced one after the

other and from one another, but they are produced and re-produced simultaneously, alongside one another. What ap-pears as the effect of antecedent labor, if one considers theproduction process of the individual commodity, presents it-self at the same time as the effect of coexisting labor, if oneconsiders the reproduction process of the commodity, thatis, if one considers this production process in its continuous

motion and in the entirety of its conditions, and not merelyan isolated action or a limited part of it. There exists notonly a cycle comprising various phases, but all the phases ofthe commodity are simultaneously produced in the variousspheres and branches of production. If the same peasantjust plants flax, then spins it, then weaves it, these oper-ations are performed in succession, but not simultaneouslyas the mode of production based on the division of laborwithin society presupposes. (Marx, 2000) A labor-value issimply the total coexisting labor required to reproduce acommodity.

To calculate labor-value we proceed as follows: begin-ning at sector i, where we imagine 1 output is produced,

we recursively trace all input paths backwards in the socialaccounting graph, counting labor inputs along the way, aprocedure known as vertical integration (Pasinetti, 1980).

For example, production of unit i requires direct laborli plus a bundle of input commodities A(

i). During theproduction of uniti the bundle of inputs are simultaneouslyreplaced by an expenditure of direct labor lA(i) operating inparallel in other sectors. But this production itself requiresas input another bundle of commodities AA(i), which arealso simultaneously replaced with the expenditure of an ad-ditional amount of direct laborlAA(i) operating in parallel.To count all the coexisting labor, i, working in parallel wemust continue the sum; that is,

i = li+ lA(i) + lAA(i) + lA2A(i) +. . .

=li+ l(I + A + A2 +. . . )A(i)

=li+ l(n=0

An)A(i). (28)

The total coexisting labor is a reduction of commodity i tothe simultaneous expenditure of work occurring in differentsectors of the economy that all contribute to its reproduc-tion. The vector of coexisting labor required to reproducethe unit bundle u= [1] is, from equation (28),

= l + l(

n=0

An)A

=l

n=0

An.

Since the technique is productive the infinite series convergesto a finite value. The Leontief inverse (I A)1 is an alter-native representation of the infinite series; hence,

= l(I A)1

and the vector of coexisting labor required to reproduce unitcommodities is identical to the standard, and well-known,

formula for labor-values, v= l(I A)1; or

v= vA + l. (29)


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14

workerhouseholds

iron

corn sugar

l1 l2 l3

a1,1 a1,2

a1,3

a2,2

a2,1

a3,3

w1(t)

w2(t)

w3(t)

A wT(t)l 0

=

a1,1 0 a1,3 w1(t)a2,1 a2,2 0 w2(t)

0 0 a3,3 w3(t)l1 l2 l3 0

FIG. 4. Social accounting graph for an example 3-sector worker-only economy.

This equation was probably first written down by Dmitriev(1868 1913) who translated the classical concept of la-bor embodied into a mathematical formula (Nuti, 1974;Dmitriev, 1974). Dmitrievs formula is now standard (e.g.,Sraffa (1960); Samuelson (1971); Pasinetti (1977); Steed-man (1981)).

We will now examine two related properties of labor-values, in the context of a worker-only economy, which aresubtle and normally overlooked.

VII.1.1. The independence of labor-values from the real wage

The recursive procedure of vertical integration ignoressome input paths in the social accounting matrix. The realwage inputs to worker households, depicted as dashed arcsin figure 4, are not traced backwards. So the direct laborused-up to produce the real wage, which maintains and re-

produces the working class, is excluded as a component ofthe cost of reproduction of commodity i. Why is this coex-isting labor ignored?

A labor-value is the answer to the question, What is thetotal labor time required to reproduce 1 unit of a commod-ity? To answer the question we assume a counter-factual:that the real cost measure, in this case quantities of la-bor, represents a resource that is used-up and therefore notreproduced during the reproduction of the commodity. Alabor-value does not measure the labor cost bothto repro-duce 1 unit of the commodity and to reproduce the laborthat was used-up. The fact that labor is required to repro-duce the real wage (and therefore the workers) during the

production of the commodity is irrelevant: the meaning of alabor-value requires that this additional cost of reproducinglabor be excluded. It would make no sense to measure the

cost of reproducing the very resource that is serving as themeasure of cost.

We can look at this another way. Any system of measure-ment defines a standard unit (e.g., the meter). We do notask, How many meters are in one meter? since the measure

of the standard unit is by definition a unit of the standard.In a labor theory of value the question, What is the labor-value of one unit of direct labor? is similarly ill-formed:the real cost of 1 hour of labor, measured by labor time, is1 hour. No further reduction is possible or required. Theself-identity of the standard of measure is a conceptual ne-cessity in any system of measurement. So whether workersconsume one bushel or a thousand bushels of corn to supplya unit of direct labor makes no difference to the labor-valueof that unit of direct labor: an hour of labor-time is anhour of labor-time, period. The procedure of vertical inte-gration over the social accounting matrix therefore alwaysterminates at labor inputs and does not further reduce labor

inputs to the real wage.For example, Marx writes that the expression labor-value

of labor-power, where labor-power is the capacity to supplylabor, denotes the difficulty of production of the real wage,which is the conventional level of consumption that repro-duces the working class. In contrast, the expression labor-value of labor embodies a confusion: the value of labor isonly an irrational expression for the value of labor-power.The expression, taken literally, is analogous to querying thecolor of a logarithm (Marx, 1971) or the time on the sun(Pollock, 2004). Labor is the substance, and the immanentmeasure of value, but has itself no value. (Marx, 1954,pg. 503).

Labor-values, as a conceptual necessity, are independentof the real wage.


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VII.1.2. Labor-values as total labor costs

Lemma 13. In a worker-only economy the supply of laborfrom worker households equals the labor-value of the realwage plus the change in the labor-value of inventories,

lqT =wmw

pwT vwT +

n

i=1

vi

dsi

dt, (30)

where (wmw/pwT)vwT is the labor-value of the real wage.

Proof. Sum equation (6), with c = 0, for all i and replacev(I A)qT by lqT using equation (29) and the conclusionfollows.

Equation (30) is an aggregate labor-flow equation that re-conceptualizes the circulation of multiple commodity typesas the circulation of a single labor substance. Interpretthe equation as follows: lqT labor is input to the systemof production. Since labor-value is conserved in exchange

this labor reappears as output either in the form of the realwage or a change in the labor embodied in the inventorystock. The real wage represents the aggregate demand forlabor time. Out-of-equilibrium the aggregate demand mis-matches the supply of labor; in consequence, the inventorystock flexes to accommodate, either increasing the store ofunsold goods, or depleting the store to meet excess demand.

In equilibrium aggregate labor-flow equation (30) col-lapses to the equality

vwT =lqT, (31)

where w = (wm

w/pwT)vwT is the equilibrium real

wage. What is the meaning of this surprising equality?In linear production theory a vertically integrated sectoror subsystem (Pasinetti, 1980) is a conceptual reclassifica-tion of an economy that cuts across the horizontal bound-aries of work location and firm ownership and consists ofa self-replacing slice of economic activity dedicated to thereproduction of a specific commodity type. As we computethe labor-value of a commodity, by recursively vertically in-tegrating over the social accounting matrix, we are also, as aside-effect, constructing the vertically integrated sector thatreproduces the commodity. The labor-value of a commod-ity is also the total direct labor supplied to its verticallyintegrated sector.

Denote l as total labor supplied and split equation (31)into two:

l= lqT,

l= vwT.

Pasinetti (1980) interprets equation (31) as expressing twodifferent ways of classifying, or disaggregating, the total la-bor l. The expression l = lqT classifies the total laboraccording to the criterion of the industry in which [it is] re-quired. The expression l = vwT classifies the total laboraccording to the criterion of the vertically integrated sectorfor which [it is] directly and indirectly required. The situa-

tion is as follows: in equilibrium workers consume real wagew while supplying lqT units of labor (when we count interms of the direct labor supplied to each sector); and, by

the definition of labor-value, vwT units of labor are sup-plied during the reproduction of the real wage w (whenwe count in terms of the coexisting labor performed in eachvertically integrated sector). Workers consume labor (in theform of the real wage) equal to the quantity they supply (inthe form of direct labor activity); that is, in equilibrium thesupply and demand for labor are equal.

Labor-values, in the context of a worker-only economy,measure total labor costsbecause they reduce allreal coststo labor costs, except the cost of reproducing labor itself,i.e. the real wage. Hence in equilibrium the total labor costof the real wage completely exhausts the supply of labor.

VII.1.3. That early and rude state

The classical proposition that long-period equilibriumprices are proportional to labor-values in a worker-onlyeconomy, where capitalist income is absent, is not contro-versial; indeed, in the context of static, equilibrium models,

even modern critics of the labor theory of value accept this(e.g., Samuelson (1971); Steedman (1981); Roemer (1982)).

Theorem 14. In a worker-only economy equilibrium pricesare proportional to labor-values,

p =vw,

where the constant of proportionality is the equilibriumwage.

Proof. By definition of a worker-only economy r = 0 andtherefore equilibrium prices, by Proposition 1, are p =pA + lw; and hence p =l(I A)1w =vw.

A commoditys natural price is the wage bill of the totalcoexisting labor required to reproduce it. So commoditiesthat require more labor-time to produce sell at higher pricesin equilibrium.

Monetary costs and labor costs are proportionate becausein both accounting systems all commodities are reduced toa single measure, either total monetary costs or total laborcosts. The dual accounting systems are then related by theprice of labor.

Smith famously argued that prices reflect labor costs inthat early and rude state of society (Smith, 1994, pg. 54)but after the accumulation of stock (i.e., the existence ofprofit income) prices no longer bear such a proportionate

relationship to labor costs.

VII.2. Labor-values in the presence of profits on stock

Figure 5 is the same 3-sector economy, producing corn,iron and sugar, but with additional material relations: themoney-capital supplied to production, m(t), and the realconsumption of capitalists, c(t). As before, 1 unit of corndirectly requires a1,1 units of corn, a2,1 units of iron, andl1 units of labor but additionally a loan of m1(t) money-capital is now required to finance the production of unitoutput. In this model, where firms are not self-financing,the money-capital coefficients are the costs of production,

m(t) =pA + lw= [mi(t)].


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workerhouseholds

iron

corn sugar

capitalisthouseholds

m1(t)

c1(t)

m3(t)

c3(t)

m2(t)c2(t)

l1 l2 l3

a1,1 a1,2

a1,3

a2,2

a2,1

a3,3

w1(t)

w2(t)

w3(t)

A w

T(t) cT(t)l 0 0

m(t) 0 0

=

a1,1 0 a1,3 w1(t) c1(t)a2,1 a2,2 0 w2(t) c2(t)

0 0 a3,3 w3(t) c3(t)l1 l2 l3 0 0

m1(t) m2(t) m3(t) 0 0

.

FIG. 5. Social accounting graph for an example 3-sector capitalist economy. Capitalist production introduces new material relationsin the economy: money-capital requirements per unit output, mi(t), and capitalist consumption per unit of money-capital supplied,ci(t).

A capitalist consumption coefficient is the quantity of com-modity i consumed per unit of money-capital supplied,

c(t) = 1

mqTcmcpcT

c= [ci(t)],

Coefficients ci(t) synchronize capitalist consumption withthe supply of money-capital and vary with the price struc-ture and capitalist savings. The coefficients do not implythat capitalist consumption is necessarily funded by inter-est on money-capital (e.g., capitalists may be dissaving andout-of-equilibrium also receive profit of enterprise).

VII.2.1. The divergence of technical and total labor costs

To calculate a labor-value we again recursively follow in-put paths in the social accounting graph adding labor costsalong the way. The production of a unit of commodity i

requires direct labor li and a bundle of input commoditiesA(i). The input commodities A(i) used-up are simultane-ously replaced by the application of additional direct labor

lA(i). But the presence of profits on stock introduces some-thing new. In this case production, unlike the worker-onlyeconomy, is controlled by the social relation of capital. Theproduction of unitiadditionally requires the loan of money-capital mi(t) (see the dashed input edges from capitalisthouseholds to the system of production in Figure 5).

Money-capital is not produced and therefore does not di-rectly incur real costs. Nobody makes money-capital, evenin circumstances where money is a commodity. The inclu-sion of an explicit financial sector, including the labor ofcapital management, would not alter the essential fact thatlending is a mere transfer of existing means of payment.Hence Marxs rejection of a natural rate of interest.

But although there are no direct labor costs there areindirect labor costs associated with the supply of money-capital. Capitalists do not supply money-capital for free,either nominally or in real terms. In parallel with the pro-duction of uniti and the supply of money-capitalmi(t), thecapitalist class consumes commodity bundlemi(t)cT(t). So

a quantity of coexisting labor,lmi(t)cT(t), is indeed used-upduring the supply of money-capital, specifically the coexist-ing labor employed to reproduce the goods that capitalists


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consume during the reproduction of uniti.The standard formula for labor-value does not vertically

integrate the input paths corresponding to the supply ofmoney-capital. Money-capital is treated as an irreducibleterminus, on the same footing as the supply of labor (e.g.,all the dashed input edges in Figure 5 are ignored). In con-sequence, standard labor-values do not count the coexisting

labor employed to reproduce capitalist consumption goodsas a real cost of production. Should this labor be countedas a cost?

Quite simply, the answer depends on what we want tomeasure. Standard labor-values provide a purely technicalmeasure of labor costs. For example, the reciprocal of astandard labor-value is a productivity index that measuresthe amount of the commodity produced by a unit of coex-isting labor. Standard labor-values facilitate productivitycomparisons across time independent of the distribution ofincome (e.g., see Flaschel (2010)). But if we want to measuretotal labor costs then, in the context of capitalist produc-tion, we cannot use standard labor-values. By definition to-

tal labor costs reduceal lreal costs to labor costs, except thecost of reproducing labor itself. But standard labor-valuesdo not include the labor cost of reproducing the capitalistclass; hence, they do not measure total labor costs. This isnot a matter of interpretation it is a simple yet overlookedfact.

Note that the labor required to produce capitalist con-sumption goods is not part of the cost of reproducing laborand therefore necessarily excluded, as a conceptual neces-sity, from any definition of labor-value.

In a monetary production economy, like capitalism,money-capital although sui generis is nonetheless a neces-sary material prerequisite to production. In consequence,

the total coexisting labor required to reproduce a commod-ity varies with the additional labor cost of reproducing thecommodities that capitalists consume during the supply ofmoney-capital necessary to finance production. A commod-ity cannot be produced without workers simultaneously per-forming tributary labor for a capitalist class.

The presence of profits on stock, i.e. production undercapitalist rules of distribution, causes technical and totallabor costs to diverge. If we aim to calculate the total co-existing labor required to reproduce a commodity then wemust treat money-capital as a bona fidecommodity and re-duce it to its (indirect) labor cost.

VII.2.2. The cause of the transformation problem

Smith and Ricardo both understood that price-value pro-portionality breaks down in the presence of profits on stock(e.g., Theorem 14 does not apply in capitalist conditions).Clearly this is a problem for a theory of value that purportsto explain the structure of natural prices.

Marx proposed therefore that prices of production aretransformed labor-values that function to redistribute themonetary representation of the labor-value of commoditiessuch that capitalists share the available pool of surplus

labor-value in proportion to the size of the money-capitalsthey advance. In Marxs view the divergence of prices ofproduction from labor-values is an apparent contradiction

or distortion that is necessarily generated by the specificdistributional rules of capitalism.

The transformation is a nominal redistribution that nei-ther creates or destroys labor-value. So Marx postulatedthree aggregate equalities between prices and labor-values:(i) the rate of profit is equal to the ratio of total surpluslabor-value to the total labor-value of capital advanced (e.g.,

r

vcT

vAqT+vwT ); (ii) the sum of the profits in all spheresof production must equal the sum of the surplus-values(Marx (1971), p. 173) (e.g., pcT vcTw); and (iii)the sum of the prices of production of the total social prod-uct equal the sum of its [labor-]value (Marx (1971), p. 173)(e.g., pqT vqTw). These conservation rules main-tain the quantitative link between labor costs and monetarycosts. On this basis Marx could argue that labor-value re-mained the ultimate referent and regulator of natural priceeven in conditions of profits on stock.

But, as is well known, when Marxs proposal is translatedinto linear production theory, his conservation claims in gen-eral cannot hold (for more detail see Wright (2009)). This isan incontrovertible mathematical fact. Since what does nothold in the special case cannot claim general validity (vonBortkiewicz, 1975) price cannot measure labor-value andthere is no rigorous quantitative connection between the la-bor time accounts arising from embodied labor coefficientsand the phenomenal world of money price accounts (Foley,2000). Prices of production are not conservative transformsof labor-values and Marxs solution appears to fail.

Ricardo (2005) had identified a key problem: prices ofproduction depend on the distribution of income (i.e., theinterest rate see equation (17)) but labor-values do not(see equation (29)); therefore natural prices have an addi-tional degree-of-freedom and vary independently of labor-values. A conservative relation cannot hold between pricesand labor-values if the price structure is not determinedsolely by objective labor costs but also by another thoughmuch less powerful cause (Ricardo (2005), p. 404-405)

The transformation problem is the primary ostensible rea-son for the modern rejection of the logical possibility of alabor theory of value. The problem has generated a largeliterature spanning well over one hundred years. Defini-tive modern critiques of Marxs theory are Samuelson (1971)and Steedman (1981). Samuelson, for example, points outthat, given the technique and real wage, one can determine(a) profits and prices and (b) labor-values. But due to the

transformation problem there is in general no way of relat-ing (a) and (b); hence, labor-values are redundant. A the-ory of economic value based exclusively on labor-cost simplycannot account for price phenomena.

But, at root, why does this problem exist at all?

Money-capital has a price, the interest rate, and an as-sociated real cost, which, in this model, is the labor-cost ofreproducing capitalist consumption goods. Prices of pro-duction count the price of money-capital as a monetarycost of production. But standard labor-values do not countthe labor-cost of the supply of money-capital as a real costof production. The price of money-capital refers to laborthat is not counted; hence there cannot be a conservative

transform between standard labor-values and prices. Theasymmetrical treatment of the commodity money-capital present as a monetary cost in the price system but absent


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as a real cost in the labor-value system is the fundamen-tal cause of the transformation problem. An accountingmismatch must necessarily arise if total monetary costs arecompared to partial labor costs.

The philosopher Ryle (1984) introduced the term cat-egory error to refer to the conceptual error of expectingsome concept or thing to possess properties that it cannot

have.5

Category errors generate theoretical difficulties thatappear insoluble because they are ill-posed at their hiddenconceptual foundations. Only conceptual analysis, i.e. theidentification and removal of the underlying category error,can resolve, or more properly dissolve, the problems.

The transformation problem is the theoretical manifesta-tion of a category error that conflates technical and totallabor costs.6 Technical labor costs cannot have propertiesthat belong to total labor costs (and vice versa). This isthe deep conceptual error at the heart of the classical labortheory of value. This error has been, and continues to be,the major obstacle toward a deeper understanding of the re-lationship between social labor and monetary phenomena.

For example, the error has obscured the existence of a con-servative quantitative relation between prices of productionand labor-time, as we will now show.

VII.2.3. Total labor costs: nonstandard labor values

Nonstandard labor-values (Wright, 2007, 2009) are thelabor-values that result when we include the real cost ofcapitalist consumption in the process of vertical integration.For example, and returning to the example in figure 5, inaddition to lA(i) labor used-up to replace input commoditiesA(i) we now also count thelmi(t)cT(t) labor simultaneously

used-up to replace consumption goods mi(t)c(t).The matrix of capitalist consumption coefficients is

C(t) =cT

2011 classical macrodynamics and the labor theory of value

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