econ 155 mt 1 slides
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Econ 155Urban Economics
Lecture 2
9/9/13
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Why do cities exist?
Natural advantages
Trade / transport costs
Increasing returns / economies of scale Spillovers
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Baseline Case: Backyard
Economy
No differences in productivity for labor or
land
Constant returns to scale in exchange
Constant returns to scale in production
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Backyard equilibrium
No Trade
No productivity benefit from specialization and
exchange
Exchange is costly (time) without any benefit
No Cities
Dense living is costly (bid up price of land) withoutany benefit
Result: Uniform price of land and population density
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Trading Cities
Drop assumption of equal productivity
Differences in productivity generate
comparative advantage
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Gross gain from trade = 2 shirts for each
region
Net gain = gross gain - transaction time (t)
North: If t < 20 min (time for 2 shirts), net gain > 0
South: If t < 2 hr (time for 2 shirts), net gain > 0
Computing the Net Gain From
Trade
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In absence of scale economies, households
will trade directly
Scale economies in exchange: lower cost fora trading firm
Trade workers live close to firms and bid up
land price
Higher price of land increases density,
generating a trading city
Scale Economies in Exchange
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Trading Cities in Antiquity
Trade was risky
Firms in trading cities provided: insurance,
credit, banking, and legal services.
Classic trading cities:
Athens
Byzantium/Constantinople/Istanbul
Aleppo (Syria)
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Cotton gin and cotton-trade cities
Transport technology: turnpikes, canals,
steamship, railroad
Trading Cities in American History
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Bleakley and Lin (2011) Portage and Path Dependence
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Drop assumption of constant returns to scale
in production
Productivity Numbers
Home = 1 shirt per hour
Factory = 6 shirts per hour
Home or factory: 1 loaf of bread per hour
Factory Town
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Equilibrium
Workers indifferent between home
production and working in urban factory
Suppose urban cost of living is 50% higher
Then urban wage must be 50% higher
City worker will pay one half loaf for land,
leaving 1 loaf for consumption (same as w/home production)
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The price of shirts at the factory is the unit cost of 1/3 loaf = 4/12 loaf
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The net price of a factory shirt is the factory price (4/12 loaf) plustransport cost (1/12 loaf pr mile)
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F t T D l A d
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Workers live close to factory to economize
on commuting time
Competition for land bids up its price
Higher price of land increases density,
generating a city
Factory workers paid 1/2 loaf per hour to cover
higher cost of living
Factory Town Develops Around
the Factory
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Competition generates zero economic profit
Firms enter the shirt market until each makes
zero economic profit
Factory Towns in the Region
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Factory Towns in the Region
Factories span the region
Every location lies within market area of a
factory
Complete labor specialization, with rural
bread and urban shirts
Zero economic profit for firms & locationalindifference for workers
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Locational indifference in rural areas
Lower travel cost at locations close to factory
city
Rural households bid up the price of land near
cities
Locational indifference between rural andurban areas
Factory wage compensates for higher land
prices in cities
Land Rent in the Region
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Market-oriented firm: More costly to
transport output than inputs
Shirt example: assume input transport cost= 0
Firms oriented toward markets to
economize on output transport cost
Weight gaining activity: beverages produced
from local water & syrup
Fragility gaining: Fresh food
Location Orientation:
Market Orientation
O
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More costly to transport inputs than output
Firms oriented toward inputs to economize
on input transport cost Weight losing activity: produce sugar from
beets, lumber from logs
Fragility losing: Canned or frozen food
Hazard losing: deodorizing skunks
Location Orientation:
Material Orientation
S f T f S B
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Weight losing industry (only 15% sugar)
Scale economies in processing, so number
of plants is relatively small
Farmers sell beets to processing plant
offering highest net price
Entry and competition generates zero profit
System of Towns for Sugar-Beet
Processing
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Oth E l f M t i l
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Steel towns: near coal, then ore
Leather towns near forest for tannin
Lumber towns near forests
Other Examples of Materials-
Oriented Industries
M T f O i t d
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Transport cost is dominant location factor
Procurement cost: Raw materials from input
source to production facility
Distribution cost: Output from production site to
market
Issue: Where will a transfer-oriented firmlocate?
More on Transfer-Oriented
Firms
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Single transferable output
Single transferable input; other inputs are
ubiquitousFixed factor proportions
Fixed prices of inputs & outputs
Assumptions of Classic Model
T f O i t d Fi
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Total revenue is the same at all locations
Input costs are the same at all locations
Minimize Procurement cost + Distributioncost
PC = wi* ti * x
DC = wo* to*(xM- x)
Transfer-Oriented Firm
Minimizes Transport Costs
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Cost of transporting inputs large relative to
cost of transporting outputs
ExamplesWeight losing: Baseball bats
Inputs are perishable: canning
Inputs are bulky, fragile, or hazardous
Resource-Oriented Firms
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I d t i L ti Cl t
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Soybean and vegetable oil: Nebraska, North
Dakota, South Dakota
Mile and cheese: South Dakota, Nebraska,Montana
Sawmills: Arkansas, Montana, Idaho
Industries Locating Close to
Transportable Inputs
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Cost of transporting outputs large relative to
cost of transporting inputs
ExamplesWeight gaining: Bottling firm
Bulky output: Automobile assembly
Perishable output: Bakery
Hazardous output: weapons
Market-Oriented Firms
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Principle of Median Location
Transport costs minimized at the median location
Median: separates destinations into two equal
halves
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