The Real Interest Differential hypothesis, an exchange rate modelling breakthrough developed by Jeffrey Frankel (1979), was very successful at predicting variations of the exchange rate between 1974 and 1978 but failed when tested for its predictive ability between 1974 and 1988. Using a monetary model and long term bond expectations model as bases of comparison, it appears that Frankel's success was a product of a period when the genre of asset approach models were successful at predicting exchange rate fluctuations. The three asset approach models all succeed at predicting exchange rate variations in the late 1970's and all deteriorate and fail in the mid to late 1980's.
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