Mean Reversion in G-10 Nominal Exchange Rates

Richard J. Sweeney

Journal of Financial and Quantitative Analysis, 2006, vol. 41, issue 3, 685-708

Abstract: According to conventional wisdom, industrial country floating exchange rates contain unit roots. SUR tests on panels of monthly Group of Ten (G-10) log nominal rates reject the null of unit roots for various samples over the current float with significance levels from 0.5% to 15%. On average, in out-of-sample forecasts mean reversion models beat random walks significantly in some forecast periods. For monthly data, the range of expected USD-DEM appreciation rates exceeds 15% per year in the mean reversion model. Mean reversion places strong restrictions on international models: over the sample period, the G-10 had to run monetary policies consistent with stable long-run nominal rates.

Date: 2006
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