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Market Size, Trade, and Productivity

  • Marc J. Melitz
  • Gianmarco I. P. Ottaviano

We develop a monopolistically competitive model of trade with firm heterogeneity—in terms of productivity differences—and endogenous differences in the "toughness" of competition across markets—in terms of the number and average productivity of competing firms. We analyse how these features vary across markets of different size that are not perfectly integrated through trade; we then study the effects of different trade liberalization policies. In our model, market size and trade affect the toughness of competition, which then feeds back into the selection of heterogeneous producers and exporters in that market. Aggregate productivity and average mark-ups thus respond to both the size of a market and the extent of its integration through trade (larger, more integrated markets exhibit higher productivity and lower mark-ups). Our model remains highly tractable, even when extended to a general framework with multiple asymmetric countries integrated to different extents through asymmetric trade costs. We believe this provides a useful modelling framework that is particularly well suited to the analysis of trade and regional integration policy scenarios in an environment with heterogeneous firms and endogenous mark-ups. Copyright 2008, Wiley-Blackwell.

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Article provided by Oxford University Press in its journal The Review of Economic Studies.

Volume (Year): 75 (2008)
Issue (Month): 1 ()
Pages: 295-316

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Handle: RePEc:oup:restud:v:75:y:2008:i:1:p:295-316
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  1. Jeffrey R. Campbell & Hugo Hopenhayn, 2003. "Market size matters," Working Paper Series WP-03-12, Federal Reserve Bank of Chicago.
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