Dissecting the PPP puzzle : The unconventional roles of nominal exchange rate and price adjustments

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)135-150
Journal / PublicationJournal of International Economics
Issue number1
Publication statusPublished - Oct 2004
Externally publishedYes


The conventional view, as expounded by sticky-price models, is that price adjustment determines the PPP reversion rate. This study examines the mechanism by which PPP deviations are corrected. Nominal exchange rate adjustment, not price adjustment, is shown to be the key engine governing the speed of PPP convergence. Moreover, nominal exchange rates are found to converge much more slowly than prices. With the reversion being driven primarily by nominal exchange rates, real exchange rates also revert at a slower rate than prices, as identified by the PPP puzzle [J. Econ. Lit. 34 (1996) 647]. © 2003 Elsevier B.V. All rights reserved.

Research Area(s)

  • Generalized impulse responses, Half-life, Price adjustment speed, Purchasing power parity