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Getting PPP Right: Identifying Mean-Reverting Real Exchange Rates in Panels

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Author Info
Georgios Chortareas () (University of Athens)
George Kapetanios () (Queen Mary, University of London)

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Abstract

Recent advances in testing for the validity of Purchasing Power Parity (PPP) focus on the time series properties of real exchange rates in panel frameworks. One weakness of such tests, however, is that they fail to inform the researcher as to which cross-section units are stationary. As a consequence, a reservation for PPP analyses based on such tests is that a small number of real exchange rates in a given panel may drive the results. In this paper we examine the PPP hypothesis focusing on the stationarity of the real exchange rates in up to 25 OECD countries. We introduce a methodology that when applied to a set of established panel-unit-root tests, allows the identification of the real exchange rates that are stationary. We apply procedures that account for cross-sectional dependence. Our results reveal evidence of mean-reversion that is significantly stronger as compared to that obtained by the existing literature, strengthening the case for PPP. Moreover, our approach can be used to provide half-lives estimates for the mean-reverting real exchange rates. We find that the half-lives are shorter than the literature consensus and therefore that the PPP puzzle is less pronounced than initially thought.

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Paper provided by Queen Mary, University of London, Department of Economics in its series Working Papers with number 629.

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Date of creation: Jul 2008
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Handle: RePEc:qmw:qmwecw:wp629

Note: This is a revised version of Working Paper 517.
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Related research
Keywords: PPP Panel unit root tests Real exchange rates Half-lives PPP puzzle

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Find related papers by JEL classification:
C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: General - - - Hypothesis Testing
C15 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: General - - - Statistical Simulation Methods
C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data
F31 - International Economics - - International Finance - - - Foreign Exchange

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  1. Georgios Chortareas & George Kapetanios, 2005. "How Puzzling is the PPP Puzzle? An Alternative Half-Life Measure of convergence to PPP," Money Macro and Finance (MMF) Research Group Conference 2005 36, Money Macro and Finance Research Group. [Downloadable!]
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