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PPP Strikes Back: Aggregation and the Real Exchange Rate

Author

Listed:
  • Ravn, Morten
  • Rey, Hélène
  • Imbs, Jean
  • Mumtaz, Haroon
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.

Suggested Citation

  • Ravn, Morten & Rey, Hélène & Imbs, Jean & Mumtaz, Haroon, 2003. "PPP Strikes Back: Aggregation and the Real Exchange Rate," CEPR Discussion Papers 3715, C.E.P.R. Discussion Papers.
    • Handle: RePEc:cpr:ceprdp:3715
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    More about this item

    Keywords

    Real exchange rate persistence; Aggregation; Parameter heterogeneity; Purchasing power parity;
    All these keywords.

    JEL classification:

    • C43 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Index Numbers and Aggregation
    • F36 - International Economics - - International Finance - - - Financial Aspects of Economic Integration
    • F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics

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