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More or less aggressive? Robust monetary policy in a New Keynesian model with financial distress

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  • Gerke, Rafael
  • Hammermann, Felix
  • Lewis, Vivien

Abstract

This paper investigates the optimal monetary policy response to a shock to collateral when policymakers act under discretion and face model uncertainty. The analysis is based on a New Keynesian model where banks supply loans to transaction constrained consumers. Our results confirm the literature on model uncertainty with respect to a cost-push shock. Insuring against model misspecification leads to a more aggressive policy response. The same is true for a shock to collateral. A preference for robustness leads to a more aggressive policy. Increasing the weight attached to interest rate smoothing raises the degree of aggressiveness. Our results indicate that a preference for robustness crucially depends on the way different types of disturbances affect the economy: in the case of a shock to collateral the policymaker does not need to be as much worried about model misspecification as in the case of a conventional cost-push shock.

Suggested Citation

  • Gerke, Rafael & Hammermann, Felix & Lewis, Vivien, 2009. "More or less aggressive? Robust monetary policy in a New Keynesian model with financial distress," Discussion Paper Series 1: Economic Studies 2009,23, Deutsche Bundesbank.
  • Handle: RePEc:zbw:bubdp1:200923
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    Keywords

    Optimal monetary policy; discretion; model uncertainty; banking; collateral;

    JEL classification:

    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies
    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles

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