The bivariate relationship between real exchange rates and the real long-term interest rate differential has been investigated in a number of recent studies. By exchange-rate-equation standards, this specification does a relatively good job of tracking the historical movements in the dollar-Deutschemark and the dollar-yen bilateral exchange rates, and the dollar effective exchange rate; but does a poor job for the dollar-sterling rate. This paper extends the analysis to 18 OECD countries, in bilateral as well as effective terms. Results from earlier studies are confirmed, but in general the estimation results are sufficiently mixed to suggest that the absence of any risk premia variables may be an important omission ...