2014年-IMF国际货币组织全球_Policy_and_Spillover_Analysis_in_the_World_Economy_A_Panel_Dynamic_Stochastic_General_Equilibrium_Approach_95页_6mb

Summary of "Policy and Spillover Analysis in the World Economy: A Panel Dynamic Stochastic General Equilibrium Approach"

Core Content

This working paper introduces a panel dynamic stochastic general equilibrium (DSGE) model of the world economy, which is disaggregated into 40 national economies. The model is designed to analyze monetary and fiscal policy, spillover effects, and forecasting in a global context, incorporating nominal and real rigidities, macrofinancial linkages, and diverse spillover channels.

The model is built on the assumption that households and firms optimize intertemporarily, interacting with governments in an uncertain environment under rational expectations. It accounts for international business cycle comovement through financial linkages and is estimated using a Bayesian econometric approach with an approximate linear state space representation.

Main Theoretical Framework

A. The Household Sector

• Households are divided into credit-constrained and credit-unconstrained types.
• Credit unconstrained households can allocate their financial wealth across international short-term bonds, long-term bonds, and stocks.
• Credit constrained households only have access to domestic firm shares.
• The intertemporal utility function includes consumption, labor supply, and real financial wealth.
• Preferences are modeled with constant elasticity of substitution (CES) functions.
• The model accounts for external habit formation, labor disutility, and investment adjustment costs.
• Nominal wage and price rigidities are incorporated via monopolistic competition, staggered reoptimization, and partial indexation.

B. The Production Sector

• Output demand is determined by consumption and investment.
• Labor demand and investment are subject to adjustment costs.
• Output supply is modeled with variable capital utilization and decreasing returns to scale in commodity industries.

C. The Trade Sector

• Export and import sectors are modeled with international financial linkages.
• Import demand and import supply are influenced by nominal price rigidities.
• Exchange rate pass-through is incomplete in the short run.

D. Monetary and Fiscal Policy

• The monetary authority sets interest rates.
• The fiscal authority manages government spending and taxation.
• Market clearing conditions ensure equilibrium in output, money, bond, and stock markets.

Empirical Framework

• The model includes endogenous variables such as output, inflation, employment, and fiscal balance.
• Exogenous variables include commodity price shocks, credit risk premiums, and equity risk premiums.
• Parameter restrictions are imposed to manage the curse of dimensionality and ensure model tractability.

Estimation

• The model is estimated using a Bayesian procedure.
• Cyclical components and parameters are estimated based on prior information.
• The estimated model is used to generate impulse response functions, forecast error variance decompositions, and historical decompositions.

Policy and Spillover Analysis

A. Impulse Response Functions (IRFs)

• The paper demonstrates the effects of domestic shocks on inflation, output, employment, and interest rates.
• Shocks include productivity, labor supply, consumption demand, investment demand, monetary policy, credit risk premium, duration risk premium, equity risk premium, fiscal expenditure, and fiscal revenue.

B. Forecast Error Variance Decompositions

• The sources of variation in consumption price inflation, output, private consumption, private investment, nominal interest rate, real effective exchange rate, and unemployment rate are analyzed.
• The fiscal balance ratio and current account balance ratio are also decomposed.

C. Historical Decompositions

• The paper quantifies the historical contributions of various shocks to inflation and output growth.
• It shows that foreign shocks have significant spillover effects on domestic variables.

Spillover Analysis

• Simulated conditional betas and impulse response functions are used to analyze spillovers from foreign economies.
• The results show that foreign shocks such as productivity, labor supply, consumption demand, investment demand, monetary policy, credit risk premium, duration risk premium, equity risk premium, fiscal expenditure, and fiscal revenue have non-negligible impacts on domestic variables.

Forecasting

• The model generates sequential unconditional forecasts for inflation and output growth.
• These forecasts are shown to outperform random walk in terms of predictive accuracy across economies and horizons.

Conclusion

• The paper develops a comprehensive panel DSGE model of the world economy.
• It demonstrates the effectiveness of the model in policy analysis, spillover analysis, and forecasting.
• The model incorporates real and nominal rigidities, macrofinancial linkages, and international spillover channels.
• It provides a framework for understanding the global implications of monetary and fiscal policies.
• The forecasting performance is robust and accurate, offering valuable insights for policy makers.

Key Information

• Model Type: Panel DSGE model with 40 national economies.
• Features: Nominal and real rigidities, macrofinancial linkages, spillover channels.
• Estimation Method: Bayesian econometrics with linear state space representation.
• Applications: Monetary and fiscal policy analysis, spillover analysis, forecasting.
• Forecast Accuracy: Sequential unconditional forecasts outperform random walk.
• Data: Includes financial assets, commodity prices, exchange rates, and fiscal variables.
• Policy Implications: Useful for understanding global effects of domestic policies.