An Unbiased Appraisal of Purchasing Power Parity

Univariate studies of the hypothesis of unit roots in real exchange rates have yielded consensus point estimates of the half-life of deviations from purchasing power parity of between three to five years. However, least squares-based estimates of half-lives are biased downward. Accordingly, we follo...

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Main Author: McDermott, C. John
Other Authors: Cashin, Paul
Format: eBook
Language:English
Published: Washington, D.C. International Monetary Fund 2001, 2001
Series:IMF Working Papers; Working Paper
Subjects:
Online Access:
Collection: International Monetary Fund - Collection details see MPG.ReNa
Summary:Univariate studies of the hypothesis of unit roots in real exchange rates have yielded consensus point estimates of the half-life of deviations from purchasing power parity of between three to five years. However, least squares-based estimates of half-lives are biased downward. Accordingly, we follow Andrews (1993) and use median-unbiased estimators of the half-life of deviations from parity as a preferred measure of the persistence of real exchange rate shocks. We study this issue using real effective exchange rate (REER) data for 22 industrial countries in the post-Bretton Woods period. Three methods of bias correction are implemented, which yield cross-country averages of half-lives of deviations from parity ranging between 4 to 15 years, with the REER of several countries displaying permanent deviations from parity
Physical Description:35 p.
ISBN:9781451859966
1451859961