Activity (Process)

Using the Policy Interest Rate to Counter Supply-Shock Inflation

To combat the inflation from a negative supply shock, a central bank uses its primary tool: the nominal policy interest rate. The bank must increase the policy rate by an amount greater than the rise in expected inflation. This ensures, via the Fisher equation, that the real interest rate increases. The higher real interest rate then dampens aggregate demand, shifting the AD curve downward and moving the economy to a new equilibrium (such as point C in a corresponding diagram) with lower output and employment, thereby closing the inflationary bargaining gap.

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Updated 2026-05-02

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