The Mechanics Behind the Theory At its core, interest rate parity exists to balance the returns on domestic and foreign investments when currency risk is hedged. Uncovered interest rate parity, however, deals with the expected changes in spot rates and does not involve hedging.
How Interest Rate Differences Fuel Arbitrage Opportunities
When the theory holds true, it suggests that markets are efficient and that current exchange rates are accurately reflecting the differential in monetary policy. These factors mean that while the theory provides a vital framework, practitioners must adjust for market inefficiencies when applying it to actual trading decisions.
Transaction costs, taxes, and political risk can create frictions that prevent arbitrageurs from exploiting small discrepancies. Traders would then borrow in the currency with the lower interest rate, convert it to the currency with the higher rate, invest it, and simultaneously sell the future proceeds forward to cover the exchange rate risk.
How Interest Rate Differences Fuel Arbitrage Opportunities
Interest rate parity is a foundational theory in international finance that explains the relationship between interest rates and the expected movement in exchange rates between two countries. If the interest rate differential is larger than the forward premium or discount, arbitrage opportunities arise.
More About What is interest rate parity
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