The International Fisher Effect (IFE) is an economic theory stating that the expected disparity between the exchange rate of two currencies is approximately equal to the difference between their countries' nominal interest rates.The International Fisher Effect (IFE) can be used to predict future changes in exchange rates and, as a result, can help investors make more informed decisions about investing in foreign markets. While the IFE is not perfect, it provides a helpful framework for understanding how changes in interest rates can impact currency values.