IMF-衡量货币和财政政策的立场（英）-2023.5-21页_1mb

Summary of IMF Working Paper: Measuring the Stances of Monetary and Fiscal Policy

Introduction

This paper addresses the measurement of monetary and fiscal policy stances using an extended New Keynesian model. It highlights the gap in theoretical consensus for fiscal policy measurement and the common reliance on the fiscal impulse, which is criticized as an inadequate proxy. The paper emphasizes the importance of jointly estimating both policy stances to avoid biases from misspecified identifying restrictions.

Theoretical Framework

The authors extend the basic New Keynesian model to incorporate fiscal policy, demonstrating that it influences the neutral stance of monetary policy through the real natural rate of interest. The stance of fiscal policy depends on structural changes in government expenditure and revenue ratios, and automatic fiscal stabilizers. Inertia in fiscal policy makes it unsuitable for fine-tuning the business cycle.

Empirical Analysis

Using a closed-form multivariate linear filter, the paper estimates monetary and fiscal policy stances for the U.S. economy based on cyclical and trend components. Joint estimation shows that fiscal policy significantly alters monetary policy stance estimates, with deviations up to 69 basis points compared to univariate filters. The fiscal impulse correlates weakly with fiscal stance (0.21), reinforcing its limitations. Results indicate countercyclical stances: monetary policy is positively correlated with inflation and output gaps, while fiscal policy aligns with output gaps of all horizons.

Robustness and Results

Sensitivity analyses reveal varying sensitivity to model parameters, but the joint estimation remains robust. The multivariate filter outperforms univariate counterparts in capturing policy dynamics. The findings challenge separate estimation practices and underscore the need for integrated approaches.

Conclusion

Accurate joint measurement of monetary and fiscal policy stances is crucial for policy objectives. The paper concludes that fiscal policy's objectives (countercyclical stabilization vs. debt sustainability) may conflict, requiring careful consideration, but joint estimation minimizes bias and improves policy insights. This approach is recommended over standalone measures.