Theoretically commodity prices are expected to overshoot the money supply in the short run but to vary with unit proportionality in the long run. This follows from the observation that consumer prices are sticky and that commodity prices, set in auction markets are fully flexible. There is...

The paper investigates, using a threshold autoregression model, the nature of nonlinear adjustments in real exchange rates (RERs) arising from the presence of transaction costs and uncertainty, and their implications for the testing of unit roots.