NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Increasing Returns and Economic Geography

Paul Krugman

NBER Working Paper No. 3275*
Issued in March 1990
NBER Program(s):   ITI    IFM

This paper develops a two-region, two-sector general

equilibriun model of location. The location of agricultural

production is fixed, but ionopolistcally competitive manufacturing

finns choose their location to maximize profits. If transportation

costs are high, returns to scale weak, and the share of spending

on manufactured goods low, the incentive to produce close to the

market leads to an equal division of manufacturing between the

regions. With lower transport costs, stronger scale economies, or

a higher manufacturing share, circular causation sets in: the more

manufacturing is located in one region, the larger that region's

share of demand, and this provides an incentive to locate still

more manufacturing there. Thus when the parameters of the economy

lie even slightly on one side of a critical "phase boundary", all

manufacturing production ends up concentrated in only one region.

*Published: JPE, Vol. 99, no. 3 (1991): 483-499. Published as "Urban Concentration: The Role of Increasing Returns and Transport Goods", IRSR, Vol. 19, nos. 1/2 (1996): 5-30.

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