IMF-利率敏感性情景指导货币政策（英）-2025.5_30页_1mb

IMF Working Paper Summary: WP/25/107

Analysis

This IMF working paper explores the monetary policy decision-making challenges under heightened uncertainty, especially in the context of post-pandemic inflation dynamics. The central premise is to provide a flexible framework for policymakers to incorporate various sources of uncertainty into their strategies. The paper focuses on four key dimensions:

• Expectation formation process (Rational Expectations vs. Adaptive Learning)
• Inflation persistence
• Neutral interest rate estimation
• Slope of the Phillips curve

Key Aspects

1. Framework for Uncertainty Assessment:

   • The paper introduces a framework integrating Bayesian estimation and scenario analysis to quantify risks.
   • Policymakers can test "sensitivity scenarios" based on erroneous assumptions (e.g., misjudging the neutral rate or Phillips curve slope) and compare welfare losses.

2. Expectation Formation Processes:

   • Rational Expectations (RE): Assumes agents use all available information.
   • Adaptive Learning (AL): Simulates how agents learn from pastforecast errors, leading to slower adjustments in expectations.
   • Convergence: AL expectations resulted in slightly looser policy paths in simulations due to lower inflation expectations compared to RE.

3. Inflation Persistence Uncertainty:

   • Simulations show that a 30% lower/upper core inflation bound leads to divergent policy paths; the ECB must balance tightening/flexing based on projection confidence.

4. Neutral Rate Measurement:

   • Natural rate estimation varies significantly across models (median vs. RE models).
   • Underestimation of the neutral rate leads to higher welfare costs than overestimation.

5. Phillips Curve Slope:

   • Policy errors in estimating the Phillips curve slope increase deviations in interest rates and inflation.
   • A conservative approach (err on the tighter side) minimizes welfare loss.

6. Central Bank Preferences:

   • Adjusting social welfare weights (output vs. inflation) produces policy path shifts of around 25–50bps.

Conclusion

The framework is designed to enhance risk management in monetary policy, encouraging robustness through scenario simulations. The ECB is advised to prioritize conservative preferences (high inflation weightage) during persistently high uncertainty. extensions to the methodology allow for broader applicability beyond the Euro-area context.