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International Trade and Income Distribution: A Reconsideration

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  • Paul R. Krugman

Abstract

The postwar expansion of trade among the industrial countries has not had the strong distributional effects which standard models of trade would have led us to expect. This paper develops a model which attempts to explain this observation, while at the same time making sense of some other puzzling empirical aspects of world trade. The basis of the model is a distinction between two kinds of trade: "Heckscher-Ohlin" trade, based on differences in factor proportions, and "intraindustry" trade, based on scale economies and product differentiation. To incorporate intraindustry trade into the model it is necessary to drop the usual assumptions of constant returns to scale and perfect competition; instead the paper deals with a world where economies of scale are pervasive and all firms possess some monopoly power. Surprisingly, it is nonetheless possible to develop a fully-worked-out general equilibrium model which remains simple and can be used to compare autarky and free trade. Two main results emerge from the analysis. First, the nature of trade depends on how similar countries are in their factor endowments. As countries become more similar, the trade between them will increasingly become intra-industry in character. Second, the effects of opening trade depend on its type. If intraindustry trade is sufficiently dominant the advantages of extending the market will outweigh the distributional effects, and the owners of scarce as well as of abundant factors will be made better off.

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Bibliographic Info

Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 0356.

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Date of creation: Jun 1979
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Publication status: published as Krugman, Paul R. "Intraindustry Specialization and the Gains from Trade." Journal of Political Economy, Vol. 89, No. 5, (October 1981), pp. 959-973.
Handle: RePEc:nbr:nberwo:0356

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  1. Dixit, Avinash K & Stiglitz, Joseph E, 1977. "Monopolistic Competition and Optimum Product Diversity," American Economic Review, American Economic Association, American Economic Association, vol. 67(3), pages 297-308, June.
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