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State of the Art Unit Root Tests and Purchasing Power Parity

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  • Lopez, Claude
  • Murray, Christian J
  • Papell, David H

Abstract

Although the question of whether Purchasing Power Parity (PPP) holds in the long run has been extensively studied, the answer is still controversial. Some of the strongest evidence is provided by Taylor (2002), who concludes that long-run PPP held over the twentieth century. We argue that this conclusion is quite sensitive to the use of sub-optimal lag selection in unit root tests. Using superior lag selection methods, we find that long run PPP held for the real exchange rates of only 9 out of the 16 industrialized countries in Taylor's sample with the U.S. dollar as the base currency.

Suggested Citation

  • Lopez, Claude & Murray, Christian J & Papell, David H, 2005. "State of the Art Unit Root Tests and Purchasing Power Parity," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 37(2), pages 361-369, April.
  • Handle: RePEc:mcb:jmoncb:v:37:y:2005:i:2:p:361-69
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    More about this item

    JEL classification:

    • F3 - International Economics - - International Finance
    • C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes

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