16793 theory of_cost
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theory of costTRANSCRIPT
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Theory of Cost
General Economics
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General Economics: Theory of Cost 2
Cost Analysis • Cost Analysis refers to the Study of Behaviour
of Cost in relation to one or more Production Criteria like size of Output, Scale of Operations, Prices of Factors of Production.
• In other words, Cost Analysis related to the Financial Aspects of Production Relations against Physical Aspects.
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General Economics: Theory of Cost 3
Cost Concepts
Accounting Cost
& Economic Cost
Outlay Cost
&
Opportunity Cost
Direct Cost & Indirect
Cost
Fixed Cost
&
Variable Cost
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General Economics: Theory of Cost 4
Accounting Costs • Accounting Costs are those Costs which are
actually incurred & recorded in the Books of Accounts by the Firm in Payment for Various Factors of Production.
• For Example, Wages to workers employed; Rent for the Building he hires; Prices of the Raw Materials; Fuel & Power, etc.
• Also Called as Explicit Cost.
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General Economics: Theory of Cost 5
Economic Costs • It includes:
– The Normal Return on Money Capital invested by the Entrepreneur himself in his own Business. (Implicit Cost)
– The Wages & Salary not Paid to the Entrepreneur but could have been Earned if the Services had been Sold somewhere else.
• Economic Cost = Accounting Cost + Implicit Cost
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General Economics: Theory of Cost 6
Outlay Costs • Involves Actual Expenditure of Funds
e.g. Wages, Rent, Interest, etc.
• Outlay Costs are recorded in the
Books of Accounts as it involves
Financial Expenditure at some Time.
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General Economics: Theory of Cost 7
Opportunity Costs • The Opportunity Cost is the Return Expected
from the Second Best use of the Resources, which is Foregone for availing the Gains from the Best use of the Resources.
• It is not recorded in the Books of Accounts.
• It is very useful in Long Term Cost Calculations e.g., In calculating the Cost of Higher Education, it is not the Tuition Fee & Books but the earning foregone that should be taken into account.
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General Economics: Theory of Cost 8
Direct Costs & Indirect Costs • Direct Costs are Costs that are readily
identified and are Traceable to a particular Product, Operation or Plant. E.g., Manufacturing Costs to a Product Line.
• Indirect Costs are Costs that are not readily identified and are not Traceable to a particular Product, Operation or Plant. E.g., Electric Power, Salary to Gatekeeper, etc. Although not Traceable but bears Functional Relationship to Production.
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General Economics: Theory of Cost 9
Fixed Costs & Variable Costs • Fixed Costs require a Fixed Expenditure of Funds
irrespective of the Level of Output e.g. Rent, Interest on Loans, Depreciation, etc.
• Fixed Cost does not vary with the Volume of Output within a Capacity Level.
• Fixed Cost may disappear on the Complete Shut Down of Business.
• Variable Costs are costs that are a Function of Output in the Production Period e.g. Wages & Cost of Raw Materials.
• Variable Costs vary Directly or sometimes Proportionately with Output.
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General Economics: Theory of Cost 10
Cost Function • The Cost Function refers to the Mathematical
relation between Cost of a Product and the various Determinants of Costs.
C = f(Q, T, Pf, K) Where, C = Total Cost Q = Quantity Produced i.e. Output T = Technology Pf = Factor Price K = Capital
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General Economics: Theory of Cost 11
Cost Function
Short Run Cost
Function C = f(Q)
Long Run Cost Function
C = f(Q, T, Pf, K)
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General Economics: Theory of Cost 12
Short Run Costs
Fixed Cost Variable
Cost
Total Cost
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General Economics: Theory of Cost 13
Short Run Fixed Cost (FC) • Fixed Costs are those costs which are
Independent of Output i.e. they do not change with changes in Output.
• They are a “Fixed Amount” incurred by the Firm, irrespective of Output.
• In case of Firm Shut Down for some time, Fixed Costs are to be borne by the Firm.
• For Example, Contractual Rent, Property Tax, Interest on Capital Employed, etc.
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General Economics: Theory of Cost 14
Short Run Variable Cost (VC)
• Variable Costs are those costs which changes with changes in Output.
• Includes Payments such as Wages of Labour, Price of Raw Material, etc.
• In case of Firm Shut Down for some time, Variable Costs does not occur and hence avoided by the Firm.
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General Economics: Theory of Cost 15
Short Run Total Cost (TC) • Total Cost is defined as the Total
Actual Cost that must be incurred to Produce a given Quantity of Output.
• Total Costs is the sum of the Total Variable Costs and the Fixed Costs.
TC = TFC = TVC
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General Economics: Theory of Cost 16
Short Run Total Cost Curves Price Cost
Output (Q)
Y
O X
FC
VC TC
Fixed Cost
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General Economics: Theory of Cost 17
Short Run Average Costs
Average Fixed Cost
Average Variable
Cost
Average
Total Cost
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General Economics: Theory of Cost 18
Short Run Average Fixed Cost (AFC)
• Average Fixed Cost is Total Fixed Cost (TFC) divided by the Number of Units of Output Produced.
• Referred to as “Fixed Cost per unit of Output”.
• AFC steadily falls as Output Increases meaning thereby, it slopes Downwards but does not touch X- Axis as AFC ≠ 0
TFCAFC = Q
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General Economics: Theory of Cost 19
Short Run Average Variable Cost (AVC)
• Average Variable Cost is Total Variable Cost (TVC) divided by the Number of Units of Output Produced.
• Referred to as “Variable Cost per unit of Output”.
• AVC normally falls as Output Increases from O to Normal Capacity of Output du
TVCAVC = Q
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General Economics: Theory of Cost 20
Short Run Average Variable Cost (AVC)
• AVC normally falls as Output Increases from O to Normal Capacity of Output due to occurrence of Increasing Returns.
• Beyond Normal Capacity of Output, AVC rises steeply as Diminishing Returns occurs.
• AVC first Falls, reaches its Minimum and then rises again.
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General Economics: Theory of Cost 21
Short Run Average Total Cost (ATC)
• Average Total Cost is the Sum Total of Average Variable Cost & Average Fixed Cost.
ATC = AFC + AVC • It is referred to as “Total Cost per unit of
Output”.
• Behaviour of ATC depends upon the Behaviour of AVC & AFC.
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General Economics: Theory of Cost 22
Short Run Average Total Cost (ATC)
• Since in beginning, Both AFC & AVC Falls, therefore, ATC Curve also falls.
• When AVC ↑ , AFC ↓, ATC continues to fall as AFC > AVC.
• As Output Increases, AVC ↑ and thus
AVC > AFC and hence ATC ↑.
• ATC is a “U” Shaped Curve.
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General Economics: Theory of Cost 23
Short Run Marginal Cost (MC)
• Marginal Cost is the addition made to the Total Cost by Production of an Additional Unit of Output.
MC = TCn – TCn-1 • Marginal Cost is Independent of Fixed Cost.
• As Marginal Product first rises, reaches maximum & then declines, thus, Marginal Cost first declines, reaches minimum & then rises.
• MC curve of a Firm is “U” Shaped.
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General Economics: Theory of Cost 24
Short Run Average & Marginal Cost Curves
Price Cost
Output (Q)
AFC
AVC ATC MC
Y
O X
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General Economics: Theory of Cost 25
Units of Output
TFC TVC TC AFC AVC ATC MC per unit
0 150 0 150 - - - -
6 150 50 200 25.0 8.33 33.33 50/6 =8.33
16 150 100 250 9.38 6.25 15.63 50/10 =5.00
29 150 150 300 5.17 5.17 10.34 50/13 =3.85
44 150 200 350 3.41 4.55 7.95 50/15 =3.33
55 150 250 400 2.73 4.55 7.27 50/11 =4.55
60 150 300 450 2.50 5.00 7.50 50/5 =10.00
Various Costs
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General Economics: Theory of Cost 26
Relationship of MC & AC • When Marginal Cost is below Average
Cost, it is pulling Average Cost down.
• When Marginal Cost is above Average Cost, it is pulling Average Cost up.
• When Marginal Cost just equals Average Cost, Average Cost is neither rising nor falling & is at its Minimum. Hence, at the bottom of a U-shaped Average Cost, MC = AC = Minimum AC.
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General Economics: Theory of Cost 27
Long Run Average Cost Curve • Long Run is a period of Time during which the
Firm can vary all of its Inputs. • The Firm moves from one plant to another in
Long Run. To Increase the Output, Firm acquires Big Plant & vice versa.
• Long Run Cost of Production is the least possible Cost of Producing any given level of Output when all Individual Factors are Variable.
• The Minimum Point on LRAC Curve is the “Minimum Efficient Scale”.
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General Economics: Theory of Cost 28
Short Run Average Cost Curves deriving Long Run Average Cost Curves
Y
H
L Q
J
K
R
O A B C D X
SAC1 SAC2 SAC3 Average
Cost
Output (Q)
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General Economics: Theory of Cost 29
Long Run Average Cost Curve
Average
Cost
Output
Y
O M N V Q W X
G F
K H P
T
SAC1 SAC2
SAC3 SAC4
SAC5 SAC6
SAC7 LAC
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General Economics: Theory of Cost 30
Long Run Average Cost Curve • Long Run Cost Curve depicts the Functional
relationship between Output & the Long Run Cost of Production.
• It envelopes the set of U-Shaped Short-Run Average Cost Curves Corresponding to different Plant Sizes.
• LRAC Curve is “U-Shaped”, reflecting Economies of Scale (or Increasing Returns to Scale) when Negatively Sloped and Diseconomies of Scale (or Decreasing Returns to Scale) when Positively Sloped.
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General Economics: Theory of Cost 31
Long Run Average Cost Curve • Every Point on the Long Run Average Cost
Curve is a Tangency Point with some Short Run AC Curve.
• LAC Curve is not a Tangent to the minimum points of the SAC Curves.
• LAC Curve is called as “Planning Curve” as a Firm Plans to Produce any Output in the Long Run by choosing a Plant on the Long Run Average Cost Curve corresponding to the given Output.
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General Economics: Theory of Cost 32
Q1 Which Cost Increases with the Increase in
Production?
a) Average Cost.
b) Marginal Cost.
c) Fixed Cost.
d) Variable Cost.
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General Economics: Theory of Cost 33
Q2 Which of the following Cost Curves is never
‘U’ shaped?
a) Average Cost Curve.
b) Marginal Cost Curve.
c) Average Variable Cost Curve.
d) Average Fixed Cost Curve.
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General Economics: Theory of Cost 34
Q3 Total Cost in the Short Run is classified into Fixed
Cost & Variable Cost. Which one of the following is a Variable Cost?
a) Cost of Raw Materials.
b) Cost of Equipment.
c) Interest payment on past Borrowings.
d) Payment of Rent on Building.
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General Economics: Theory of Cost 35
Q4 In the Short Run, when the Output of a Firm
Increases, its Average Fixed Cost:
a) Increases.
b) Decreases.
c) Remains Constant.
d) First declines & then rises.
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General Economics: Theory of Cost 36
Q5 Which of the following is also known as
‘Planning Curve’?
a) Long Run Average Cost Curve.
b) Short Run Average Cost Curve.
c) Average Variable Cost Curve.
d) Average Total Cost Curve.
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General Economics: Theory of Cost 37
Q6 The Cost of one thing in terms of the
alternative given up is known as:
a) Production Cost.
b) Physical Cost.
c) Real Cost.
d) Opportunity Cost.
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General Economics: Theory of Cost 38
Q7 With which of the following is the Concept
of Marginal Cost closely related ?
a) Variable Cost.
b) Fixed Cost.
c) Opportunity Cost.
d) Economic Cost.
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General Economics: Theory of Cost 39
Q8 Which of the following statement is correct? a) When Average Cost is rising, Marginal
Cost must also be rising. b) When Average Cost is rising, Marginal
Cost must be falling. c) When the Average Cost is rising, Marginal
Cost is above the Average Cost. d) When Average Cost is falling, Marginal
Cost must be rising.
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General Economics: Theory of Cost 40
Q9 Which of the following is an example of an
“Explicit Cost”?
a) The wages of a Proprietor could have made by working as an employee of a large firm.
b) The income that could have been earned in alternative uses by the resources owned by the Firm.
c) The Payment of Wages by the Firm.
d) The Normal Profit earned by the Firm.
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General Economics: Theory of Cost 41
Q10 Which of the following is an example of an
“Implicit Cost”? a) Interest that could have been earned on
Retained Earnings used by the Firm to finance Expansion.
b) The Payment of Rent by the Firm for the Building in which it is housed.
c) The Interest Payment made by Firm for funds Borrowed from a Bank.
d) The Payment of Wages by the Firm.
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General Economics: Theory of Cost 42
Q11 Marginal Cost is defined as:
a) The Change in Total Cost due to a One Unit Change in Output.
b) Total Cost divided by the Output.
c) The Change in Output due to one Unit Change in an Input.
d) Total Product divided by the Quantity of Input.
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General Economics: Theory of Cost 43
Q12 Which of the following is true of the relationship
between the Marginal Cost Function & the Average Cost Functions?
a) If MC is greater than ATC, the ATC is falling.
b) The ATC curve intersects the MC curve at minimum MC.
c) The MC Curve intersects the ATC curve at minimum ATC.
d) If MC is less than ATC, then ATC is increasing.
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General Economics: Theory of Cost 44
Q13 Which of the following statements is true of
the relationship among the Average Cost Functions?
a) ATC = AFC – AVC.
b) AVC = AFC + ATC.
c) AFC = ATC + AVC.
d) AFC = ATC – AVC.
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General Economics: Theory of Cost 45
Q14 Which of the following is not a determinant
of the Firm’s Cost functions?
a) The Production Function.
b) The Price of Labour.
c) Taxes.
d) The Price of the Firm’s Output.
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General Economics: Theory of Cost 46
Q15 Which of the following statements is correct
concerning the relationships among the Firm’s Functions?
a) TC = TFC – TVC.
b) TVC = TFC - TC.
c) TFC = TC - TVC.
d) TC = TVC – TFC.
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General Economics: Theory of Cost 47
Q16 Suppose Output increases in the Short Run.
Total Cost will: a) Increase due to an Increase in Fixed Costs
only. b) Increase due to an Increase in Variable Costs
only. c) Increase due to an Increase in both Fixed and
Variable Costs. d) Decrease in the Firm is in the Region of
Diminishing Returns.
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General Economics: Theory of Cost 48
Q17 Which of the following statements concerning the Long-
Run Average Cost Curve is False? a) It represents the Least-Cost Input Combination for
producing each level of Output. b) It is derived from a Series of Short Run Average
Cost Curves. c) The Short Run Cost Curve is at Minimum Point of
the Long-Run Average Cost Curve represents the Least-Cost Plant Size for all levels of Output.
d) As Output Increases, the Amount of Capital Employed by the Firm Increases along the Curve.
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General Economics: Theory of Cost 49
Q18 The Negatively sloped (i.e. falling) part of the
Long-Run Average Total Cost Curve is due to which of the following?
a) Diseconomies of Scale.
b) Diminishing Returns.
c) The difficulties encountered in coordinating the many activities of large Firm.
d) The increase in productivity that results from Specialization.
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General Economics: Theory of Cost 50
Q19 The Positively sloped (i.e. rising) part of the
Long-Run Average Total Cost Curve is due to which of the following?
a) Diseconomies of Scale. b) Increasing Returns. c) The Firm being able to take advantage of
Large-Scale Production Techniques as it expands its output.
d) The increase in productivity that results from Specialization.
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General Economics: Theory of Cost 51
Q20 A Firm’s Average Total Cost is Rs.300 at 5
units of Output & Rs.320 at 6 units of Output. The Marginal Cost of Producing the 6th unit is:
a) Rs.20
b) Rs.120
c) Rs.320
d) Rs.420
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General Economics: Theory of Cost 52
Q21 A Firm producing 7 units of Output has an
Average Total Cost of Rs.150 & has to pay Rs.350 to its Fixed Factors of Production whether it produces or not. How much of the Average Total Cost is made up of Variable Costs?
a) Rs.200 b) Rs.50 c) Rs.300 d) Rs.100
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General Economics: Theory of Cost 53
Q22 A Firm has a Variable Cost of Rs.1000 at 5
units of Output. If Fixed Costs are Rs.400, what will be the Average Total Cost at 5 units of Output?
a) Rs.280
b) Rs.60
c) Rs.120
d) Rs.1400
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THE END
Theory of Cost