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The Story of the Real Exchange Rate

Author

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  • Oleg Itskhoki
Abstract
The real exchange rate (RER) measures relative price levels across countries, capturing deviations from purchasing power parity (PPP). RER is a key variable in international macroeconomic models as it is central to equilibrium conditions in both goods and asset markets. It is also one of the most starkly-behaved variables empirically, tightly co-moving with the nominal exchange rate and virtually uncorrelated with most other macroeconomic variables, nominal or real. This survey lays out an equilibrium framework of RER determination, focusing separately on each building block and discussing corresponding empirical evidence. We emphasize home bias and incomplete pass-through into prices with expenditure switching and goods market clearing, imperfect international risk sharing, country budget constraint and monetary policy regime. We show that RER is inherently a general-equilibrium variable, which depends on the full model structure and policy regime, and therefore partial theories like PPP are insufficient to explain it. We also discuss issues of stationarity and predictability of exchange rates.

Suggested Citation

  • Oleg Itskhoki, 2020. "The Story of the Real Exchange Rate," NBER Working Papers 28225, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:28225
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    4. Mary Amiti & Oleg Itskhoki & Jozef Konings, 2022. "Dominant Currencies: How Firms Choose Currency Invoicing and Why it Matters," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 137(3), pages 1435-1493.
    5. Eicher, Theo S. & Kawai, Reina, 2023. "IMF trade forecasts for crisis countries: Bias, inefficiency, and their origins," International Journal of Forecasting, Elsevier, vol. 39(4), pages 1615-1639.
    6. Cosimo Petracchi, 2021. "The Mussa Puzzle: A Generalization," Working Papers 2021-001, Brown University, Department of Economics.
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    JEL classification:

    • E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation
    • F31 - International Economics - - International Finance - - - Foreign Exchange
    • F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets

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