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Differences In Income Elasticities and Trends in Real Exchange Rates

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  • Paul Krugman

Abstract

One might expect that differences in income elasticities in trade and/or differences in growth rates among countries would give rise to strong secular trends in real exchange rates; for example, fast-growing countries might need steady depreciation to get the world to accept their growing exports. In fact, however, income elasticities are systematically related to growth rates by the "45-degree rule", under which fast-growing countries appear to face high income elasticities of demand for their exports, while having low income elasticities of import demand. The net effect of this relationship between elasticities and growth rates is that secular trends in real exchange rates are much smaller than one might otherwise have expected: relative PPP holds fairly well. This paper documents the existence of a "45-degree rule", and suggests an explanation in terms of increasing returns and product differentiation.

Suggested Citation

  • Paul Krugman, 1988. "Differences In Income Elasticities and Trends in Real Exchange Rates," NBER Working Papers 2761, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:2761
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    1. Krugman, Paul, 1980. "Scale Economies, Product Differentiation, and the Pattern of Trade," American Economic Review, American Economic Association, vol. 70(5), pages 950-959, December.
    2. Jagdish Bhagwati, 1969. "Trade, Tariffs, and Growth," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262523590, December.
    3. Morris Goldstein & Mohsin S. Khan, 2017. "Income and Price Effects in Foreign Trade," World Scientific Book Chapters, in: TRADE CURRENCIES AND FINANCE, chapter 1, pages 3-81, World Scientific Publishing Co. Pte. Ltd..
    4. Dixit, Avinash K & Stiglitz, Joseph E, 1977. "Monopolistic Competition and Optimum Product Diversity," American Economic Review, American Economic Association, vol. 67(3), pages 297-308, June.
    5. Jagdish Bhagwati, 1958. "Immiserizing Growth: A Geometrical Note," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 25(3), pages 201-205.
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