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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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