Problem

Policymaker's Incentive to Counter a Negative Demand Shock

After a negative aggregate demand shock causes an economic downturn, policymakers must decide how to respond. Their incentive to act is significantly increased by the risk of a deflationary spiral. This risk arises because if the initial low inflation persists, it can cause people to lower their inflation expectations. A drop in expectations shifts the Phillips curve downward, potentially leading to deflation, a cycle of falling prices. This threat motivates intervention, especially since the private sector does not typically self-correct to restore the economy.

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Updated 2026-05-02

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