During 1970s, three competing theories of exchange rate determination were developed: the flexible price monetary model, the sticky price monetary model, and the portfolio balance model. The aim of these models has been to give a plausible explanation to volatility in exchange rates, especially after the adoption of the flexible exchange rate system. The empirical findings of the models have not been supportive of the predictions of the models. The purpose of this paper is to analyze these theoretical models in a detailed form to evaluate whether they have been adequate in explaining volatility in exchange rates.
