Theory

Real Interest Parity

Real Interest Parity is a theory that emerges from the long-run relationship between interest and inflation differentials (iiππi - i^* \approx \pi - \pi^*). By rearranging this relationship, we get the first expression of Real Interest Parity: iπ=iπi - \pi = i^* - \pi^* This equation shows that the domestic real interest rate (nominal rate i minus inflation \pi) equals the foreign real interest rate (nominal rate i^* minus inflation \pi^*). Because the real interest rate is defined as r=iπr = i - \pi, this relationship can be expressed more concisely and equivalently as: r=rr = r^* This second formula states directly that the domestic real interest rate (rr) must equal the foreign real interest rate (rr^*).

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Updated 2026-05-02

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