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A Panel Project on Purchasing Power Parity: Mean Reversion Within and Between Countries

  • Frankel, Jeffrey A
  • Rose, Andrew K

Previous time-series studies have shown evidence of mean-reversion in real exchange rates. Deviations from purchasing power parity (PPP) appear to have half-lives of approximately four years. The long samples required for statistical significance are unavailable for most currencies, however, and may be inappropriate because of regime changes. In this study, we re-examine deviations from PPP using a panel of 150 countries and 45 annual observations. Our panel shows strong evidence of mean-reversion that is similar to that from long time-series. PPP deviations are eroded at a rate of approximately 15% annually, i.e. their half-life is around four years. Such findings can be masked in time-series data, but are relatively easy to find in cross-sections.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 1128.

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Date of creation: Feb 1995
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Handle: RePEc:cpr:ceprdp:1128
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  1. Michael R. Darby, 1980. "Does Purchasing Power Parity Work?," NBER Working Papers 0607, National Bureau of Economic Research, Inc.
  2. Hali J. Edison & Joseph E. Gagnon & William R. Melick, 1994. "Understanding the empirical literature on purchasing power parity: the post-Bretton Woods era," International Finance Discussion Papers 465, Board of Governors of the Federal Reserve System (U.S.).
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  8. Robert P. Flood & Mark P. Taylor, 1996. "Exchange Rate Economics: What's Wrong with the Conventional Macro Approach?," NBER Chapters, in: The Microstructure of Foreign Exchange Markets, pages 261-302 National Bureau of Economic Research, Inc.
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  16. Lothian, James R., 1997. "Multi-country evidence on the behavior of purchasing power parity under the current float," Journal of International Money and Finance, Elsevier, vol. 16(1), pages 19-35, February.
  17. Jeffrey A. Frankel, 1985. "International Capital Mobility and Crowding Out in the U.S. Economy: Imperfect Integration of Financial Markets or of Goods Markets?," NBER Working Papers 1773, National Bureau of Economic Research, Inc.
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