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Can Non-Linear Real Shocks Explain The Persistence of PPP Exchange Rate Disequilibria?

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Author Info
Tuomas A. Peltonen () (European Central Bank, Kaiserstrasse 29, D-60311 Frankfurt am Main, Germany.)
Adina Popescu () (European Central Bank, Kaiserstrasse 29, D-60311 Frankfurt am Main, Germany.)
Michael Sager () (Wellington Management, 75 State Street, Boston, MA 02109, USA and University of Warwick, Coventry CV4 7AL, UK.)

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Abstract

A core stylized fact of the empirical exchange rate literature is that half-life deviations of equilibrium real exchange rates from levels implied by Purchasing Power Parity (PPP) are very persistent. Empirical efforts to explain this persistence typically proceed along two distinct paths, resorting either to the presence of real shocks such as productivity differentials that drive equilibrium exchange rates away from levels implied by PPP, or the presence of non-linearities in the adjustment process around PPP. By contrast, we combine these two explanations in the context of an innovative panel estimation methodology. We conclude that both explanations are relevant to the behavior of exchange rates and that resulting half-lives are much shorter than estimated using linear PPP and more consistent with the observed volatility of nominal and real exchange rates. JEL Classification: F31, C23, L6-L9.

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Paper provided by European Central Bank in its series Working Paper Series with number 1073.

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Length: 41 pages
Date of creation: Jul 2009
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Handle: RePEc:ecb:ecbwps:20091073

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Related research
Keywords: EPSTAR; exchange rate; PPP; Balassa-Samuelson; productivity.;

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