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Journal of Economic Integration 2008 June;23(2) :205-236.
Agglomeration and Specialization Patterns when Firms and Workers are Footloose

Souleymane Coulibaly 

The World Bank
Copyright ©2008 Journal of Economic Integration

In new economic geography models, geographic concentration cant arise because of workers mobility or vertical linkages between firms. We examine a setup that combines those two approaches in conjunction with local congestion costs. We find that, as trade costs are lowered, the geographic concentration of total activity (agglomeration) follows an inverse u-shaped evolution, while the degree of specialization of regions increases. These results shed light on regional development within a country as integration proceeds: when trade costs are hight, firms evenly spread between the regions to supply local demand at low costs, hence diversified regions; at intermediate trade costs, we have coexistence of a diversified core and a specialized periphery and at low trade costs, each industry clusters in one region to fully exploit returns to scale externalities. US city centers and non-metropolitan areas during the period 1850-1990 depict such specialization and agglomeration patterns. These results show that a country's effort to miprove accessibility across its porfolio of places can favor a win-win regional allocation of firms based on each location's competitive advantage.

JEL classification: F12, R12, R15

Keywords: Agglomeration | Specialization | Congestion Cost | Input-Output linkages
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Production Specialization and Trade Blocs  2006 September;21(3)
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