Tests for long-run purchasing power parity (PPP) may lack power with sample periods corresponding to the span of the recent float, leading researchers to use more powerful multivariate unit root tests. We point out a potential problem with such tests: joint non-stationarity of real exchange...

The drift-adjustment method estimates the expected rate of depreciation within an exchange rate band by simple equations. Papers applying this method claim that, while forecasting a freely floating currency is hopeless, predicting an exchange rate within the future band is successful. This paper...