UNINSURED COUNTERCYCLICAL RISK: AN AGGREGATION RESULT AND APPLICATION TO OPTIMAL MONETARY POLICY

Authors


  • The editor in charge of this paper was Fabio Canova

  • Acknowledgments: We thank three referees and the editor for their very helpful comments. We also wish to thank Jordi Gali, Ippei Fujiwara, Shiba Suzuki, seminar participants at the CEPR-RIETI conference in 2008, Bank of Japan, and Singapore Management University for helpful comments. Braun and Nakajima acknowledge financial support from the Japanese Ministry of Education, Culture, Sports, Science and Technology.

E-mail: r.anton.braun@gmail.com (Braun); nakajima@kier.kyoto-u.ac.jp (Nakajima)

Abstract

We consider an incomplete markets economy with capital accumulation and endogenous labor supply. Individuals face countercyclical idiosyncratic labor and asset risk. We derive conditions under which the aggregate allocations and price system can be found by solving a representative agent problem. This result is applied to analyze the properties of an optimal monetary policy in a New Keynesian economy with uninsured countercyclical individual risk. The optimal monetary policy that emerges from our incomplete markets economy is the same as the optimal monetary policy in a representative agent model with preference shocks. When price rigidity is the only friction the optimal monetary policy calls for stabilizing the inflation rate at zero.

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