The Fisher Effect is an economic theory proposed by American economist Irving Fisher that describes the long-run relationship between nominal interest rates, real interest rates, and expected inflation — expressed as: Nominal Interest Rate = Real Interest Rate + Expected Inflation Rate. According to the Fisher Effect, when inflation expectations rise, nominal interest rates adjust upward by an equivalent amount to preserve the real return to lenders, keeping real interest rates stable in the long run. The international version — the International Fisher Effect (IFE) — extends this principle to exchange rates, positing that the expected change in the exchange rate between two currencies equals the difference in their nominal interest rates. For macroeconomic analysts and investors on Ventura Securities, the Fisher Effect is a foundational concept for understanding how RBI monetary policy, inflation expectations, and bond yields interact — and for interpreting why rising inflation typically leads to higher bond yields, lower bond prices, and currency adjustments in India and globally.
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