Sticky Inflation: Monetary Policy when Debt Drags Inflation Expectations

Saki Bigio, Nicolas Caramp and Dejanir Silva

No 206, Working Papers from Peruvian Economic Association

Abstract: We append the expectation of a monetary-fiscal reform into a standard New Keynesian model. If a reform occurs, monetary policy will temporarily aid debt sustainability through a temporary burst in inflation. The anticipation of a possible reform links debt levels with inflation expectations. As a result, interest rates have two effects: they influence demand and affect expected inflation in opposite directions. The expectations effect is linked to the impact of interest rates on public debt. While lowering inflation in the short term is possible through demand control, inflation tends to rise again due to their impact on inflation expectations (sticky inflation). Optimal monetary policy may allow negative real interest rates after fiscal shocks, temporarily breaking away from the Taylor principle. We assess whether the Federal Reserve's "staying behind the curve" was the right strategy during the recent post-Pandemic inflation surge.

Date: 2025-01
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