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Is the evidence for PPP reliable? A sustainability examination of the stationarity of real exchange rates

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  • Zhou, Su
  • Kutan, Ali M.

Abstract

Some recent time series studies testing the stationarity of real exchange rates (RERs) produce conflicting results. Using nonlinear unit root tests and recursive analysis, this paper tests whether the evidence on the stationarity of RERs is sensitive to different numeraire currencies, different sample periods covering regional and global crises, and the inclusion of countries with different levels of economic or regional integration. The results indicate that evidence for a stationary RER could be substantially sensitive to sample period changes, but not so for the currencies of the countries involved in forming the euro area. We also find that financial crises have a notable impact on testing the stationarity of RERs, depending on the numeraire currency used. We discuss the policy implications of the findings.

Suggested Citation

  • Zhou, Su & Kutan, Ali M., 2011. "Is the evidence for PPP reliable? A sustainability examination of the stationarity of real exchange rates," Journal of Banking & Finance, Elsevier, vol. 35(9), pages 2479-2490, September.
    • Handle: RePEc:eee:jbfina:v:35:y:2011:i:9:p:2479-2490
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    13. Kutan, Ali M. & Zhou, Su, 2015. "PPP may hold better than you think: Smooth breaks and non-linear mean reversion in real effective exchange rates," Economic Systems, Elsevier, vol. 39(2), pages 358-366.
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