The Common-Trend and Transitory Dynamics in Real Exchange Rate Fluctuations

This study explores the sources of real exchange rate fluctuations under the current float. Using a cointegration model of the real exchange rate, the innovations are decomposed into transitory and common-trend components. Both transitory and common-trend innovations are found to explain an appreciable portion of real exchange rate fluctuations, albeit their relative importance can vary across major currencies. Further analysis suggests that common-trend innovations are attribut- able to both productivity and monetary changes, albeit transitory innovations are linked primarily to monetary changes. The empirical results are largely consistent with an open-economy macroeconomic model.