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Higher Power Tests for Bilateral Failure of PPP after 1973

  • Graham Elliott
  • Elena Pesavento

Whilst point estimates for mean reversion in real exchange rates suggest reasonable (but long) half lives to shocks, it still remains uncomfortable that models without any mean reversion at all are often compatible with individual country pair data from the floating period. Studies with data over longer periods find mean reversion, but at the cost of mixing in data from earlier exchange rate arrangements. Pooling the floating period data for a number of countries also finds evidence of mean reversion, but at the expense of potentially mixing in country pairs with and without mean reversion. We examine tests for mean reversion for individual country pairs where greater power against close alternatives is gained through modeling other economic variables with the real exchange rate. Our results are broadly consistent with other methods to improve the power of tests for unit roots in real exchange rates, finding support for the mean reversion hypothesis.

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Paper provided by Department of Economics, Emory University (Atlanta) in its series Emory Economics with number 0502.

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Date of creation: Jan 2005
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Handle: RePEc:emo:wp2003:0502
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  1. John H. Rogers, 1998. "Monetary shocks and real exchange rates," International Finance Discussion Papers 612, Board of Governors of the Federal Reserve System (U.S.).
  2. Taylor, Alan M, 2001. "Potential Pitfalls for the Purchasing-Power-Parity Puzzle? Sampling and Specification Biases in Mean-Reversion Tests of the Law of One Price," Econometrica, Econometric Society, vol. 69(2), pages 473-98, March.
  3. Obstfeld, Maurice & Rogoff, Kenneth, 1995. "Exchange Rate Dynamics Redux," Journal of Political Economy, University of Chicago Press, vol. 103(3), pages 624-60, June.
  4. Cheung, Yin-Wong & Lai, Kon S., 2000. "On cross-country differences in the persistence of real exchange rates," Journal of International Economics, Elsevier, vol. 50(2), pages 375-397, April.
  5. Glick, Reuven & Rogoff, Kenneth, 1995. "Global versus country-specific productivity shocks and the current account," Journal of Monetary Economics, Elsevier, vol. 35(1), pages 159-192, February.
  6. Charles Engel, 1998. "Long-Run PPP May Not Hold After All," Discussion Papers in Economics at the University of Washington 0050, Department of Economics at the University of Washington.
  7. Elliott, Graham & Jansson, Michael, 2003. "Testing for unit roots with stationary covariates," Journal of Econometrics, Elsevier, vol. 115(1), pages 75-89, July.
  8. Serena Ng & Pierre Perron, 1997. "Lag Length Selection and the Construction of Unit Root Tests with Good Size and Power," Boston College Working Papers in Economics 369, Boston College Department of Economics, revised 01 Sep 2000.
  9. Kenneth Rogoff, 1996. "The Purchasing Power Parity Puzzle," Journal of Economic Literature, American Economic Association, vol. 34(2), pages 647-668, June.
  10. Jorion, Philippe & Sweeney, Richard J., 1996. "Mean reversion in real exchange rates: evidence and implications for forecasting," Journal of International Money and Finance, Elsevier, vol. 15(4), pages 535-550, August.
  11. Kenneth A. Froot & Kenneth Rogoff, 1991. "The EMS, the EMU, and the Transition to a Common Currency," NBER Working Papers 3684, National Bureau of Economic Research, Inc.
  12. Hansen, Bruce E., 1995. "Rethinking the Univariate Approach to Unit Root Testing: Using Covariates to Increase Power," Econometric Theory, Cambridge University Press, vol. 11(05), pages 1148-1171, October.
  13. Abuaf, Niso & Jorion, Philippe, 1990. " Purchasing Power Parity in the Long Run," Journal of Finance, American Finance Association, vol. 45(1), pages 157-74, March.
  14. Graham Elliott & Michael Jansson & Elena Pesavento, 2003. "Optimal Power For Testing Potential Cointegrating Vectors with Known Parameters for Nonstationarity," Emory Economics 0303, Department of Economics, Emory University (Atlanta).
  15. Maurice Obstfeld., 1993. "Model Trending Real Exchange Rates," Center for International and Development Economics Research (CIDER) Working Papers C93-011, University of California at Berkeley.
  16. Matthew Higgins & Egon Zakrajsek, 2000. "Purchasing power parity: three stakes through the heart of the unit root null," Finance and Economics Discussion Series 2000-22, Board of Governors of the Federal Reserve System (U.S.).
  17. Ng, S. & Perron, P., 1994. "Unit Root Tests ARMA Models with Data Dependent Methods for the Selection of the Truncation Lag," Cahiers de recherche 9423, Centre interuniversitaire de recherche en ├ęconomie quantitative, CIREQ.
  18. Martin Eichenbaum & Charles Evans, 1992. "Some empirical evidence on the effects of monetary policy shocks on exchange rates," Working Paper Series, Macroeconomic Issues 92-32, Federal Reserve Bank of Chicago.
  19. Kenneth A. Froot & Kenneth Rogoff, 1994. "Perspectives on PPP and Long-Run Real Exchange Rates," NBER Working Papers 4952, National Bureau of Economic Research, Inc.
  20. repec:cup:etheor:v:11:y:1995:i:5:p:1148-71 is not listed on IDEAS
  21. Jomana Amara & David Papell, 2006. "Testing for Purchasing Power Parity using stationary covariates," Applied Financial Economics, Taylor & Francis Journals, vol. 16(1-2), pages 29-39.
  22. 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.
  23. Francis X. Diebold & Steven Husted & Mark Rush, 1990. "Real exchange rates under the gold standard," Discussion Paper / Institute for Empirical Macroeconomics 32, Federal Reserve Bank of Minneapolis.
  24. Graham Elliott & Thomas J. Rothenberg & James H. Stock, 1992. "Efficient Tests for an Autoregressive Unit Root," NBER Technical Working Papers 0130, National Bureau of Economic Research, Inc.
  25. Engel, Charles & Hendrickson, Michael K. & Rogers, John H., 1997. "Intranational, Intracontinental, and Intraplanetary PPP," Journal of the Japanese and International Economies, Elsevier, vol. 11(4), pages 480-501, December.
  26. Pippenger, Michael K & Goering, Gregory E, 1993. "A Note on the Empirical Power of Unit Root Tests under Threshold Processes," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 55(4), pages 473-81, November.
  27. Beaudry, Paul & Devereux, Michael B., 1995. "Money and the real exchange rate with sticky prices and increasing returns," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 43(1), pages 55-101, December.
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