can someone answer this base on Korea and not just copy and paste the answer from a similar question. Determining Whether IFE Holds Use an online data source to record the interest rate differential between the interest rate of the foreign country in which you plan to do business and the U.S. interest rate over the last five or so quarters. Then, review the exchange rate percentage change in the foreign currency of concern over each of those corresponding quarters to determine whether the international Fisher effect (IFE) appears to hold over those quarters for that currency.