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Real exchange rate forecasting: a calibrated half-life PPP model can beat the random walk

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Abstract

This paper brings two new insights into the Purchasing Power Parity (PPP) debate. First, even if PPP is thought to hold only in the long run, we show that a half-life PPP model outperforms the random walk in real exchange rate forecasting, also at short-term horizons. Second, we show that this result holds as long as the speed of adjustment to the sample mean is imposed and not estimated. The reason is that the estimation error of the pace of convergence distorts the results in favor of the random walk model, even if the PPP holds in the long-run.

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  • Michele Ca’ Zorzi & Michal Rubaszek, 2012. "Real exchange rate forecasting: a calibrated half-life PPP model can beat the random walk," NBP Working Papers 123, Narodowy Bank Polski.
    • Handle: RePEc:nbp:nbpmis:123
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    Cited by:

    1. Michele Ca' Zorzi & Alexander Chudik, 2013. "Spatial considerations on the PPP debate," Globalization Institute Working Papers 138, Federal Reserve Bank of Dallas.

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    More about this item

    Keywords

    Exchange rate forecasting; purchasing power parity; half-life;
    All these keywords.

    JEL classification:

    • C32 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes; State Space Models
    • F31 - International Economics - - International Finance - - - Foreign Exchange
    • F37 - International Economics - - International Finance - - - International Finance Forecasting and Simulation: Models and Applications

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