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This paper shows that temporary real exchange rate fluctuations can have persistent (hysteretic) effects on trade. Specifically, when market-entry costs are sunk, sufficiently large exchange rate shocks alter domestic market structure and thereby induce hysteresis. This simple result has strong implications for exchange rate theory, t rade policy, and estimation of trade equations. Empirical evidence su ggests that the recent dollar overvaluation induced hysteresis in U.S. import prices. Namely, the aggregate pass-through equation (of exchange rates to import prices) shifted in the 1980s. The shift's nature and timing is broadly consistent with the hysteresis hypothesis. Copyright 1988 by American Economic Association.