Discussion Paper Details

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Title: PPP Strikes Back: Aggregation and the Real Exchange Rate

Author(s): Jean Imbs, Haroon Mumtaz, Morten O Ravn and Hélène Rey

Publication Date: January 2003

Keyword(s): aggregation, parameter heterogeneity, purchasing power parity and real exchange rate persistence

Programme Area(s): International Macroeconomics

Abstract: We show the importance of a dynamic aggregation bias in accounting for the PPP puzzle. We prove that established time-series and panel methods substantially exaggerate the persistence of real exchange rates because of heterogeneity in the dynamics of disaggregated relative prices. When heterogeneity is properly taken into account, estimates of the real exchange rate half-life fall dramatically - to little more than one year - or significantly below Rogoff?s ?consensus view? of three to five years. We show that corrected estimates are consistent with plausible nominal rigidities, thus, arguably, solving the PPP puzzle.

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Bibliographic Reference

Imbs, J, Mumtaz, H, Ravn, M and Rey, H. 2003. 'PPP Strikes Back: Aggregation and the Real Exchange Rate'. London, Centre for Economic Policy Research.