The theory that real interest rates are equal across countries is called

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The theory that real interest rates are equal across countries is called the international Fisher effect, which states that the difference between nominal interest rates in two countries is equal to the difference between their real interest rates, adjusted for expected changes in exchange rates. Purchasing power parity and the unbiased forward rates condition are related to exchange rates, while uncovered interest parity and interest rate parity are related to interest rates.

The Theory That Real Interest Rates Are Equal Across Countries