An interest rate differential is simply the difference in the interest rate between two currencies. This differential in the cash money markets should equal the differential between the forward and spot exchange rates. Otherwise, arbitrageurs could make a seemingly riskless profit.

In this case, the interest rate differential = 8% - 5% = 3%

Things to Remember

• Interest rate differentials reflect the difference in interest rates between two currencies and play a crucial role in the foreign exchange market.
• Arbitrage opportunities arise when interest rate differentials do not align with the forward and spot exchange rates.
• Investors often engage in carry trades based on interest rate differentials to profit from the variances in interest rates between currencies.
• Exchange rate movements can impact the overall returns of investments made based on interest rate differentials.