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Monetary Policy Committees and Model Uncertainty

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  • Peter Tillmann

    ()
    (Justus Liebig University Gießen)

Abstract

We introduce heterogeneity into a monetary policy committee by allowing the degree of model uncertainty to differ across members. It is shown that in this framework the stage at which members reach consensus matters. An aggregation protocol under which members only average policy deemed optimal from each member’s point of view leads to more volatility compared to an alternative protocol in which members agree on a common worst-case scenario from which optimal policy is then derived. The reason is that inflation, output and the interest rate are convex functions of each member’s idiosyncratic degree of model uncertainty. If the degree of model uncertainty becomes more heterogenous, inflation volatility falls due to more vigorous stabilization policy. The degree of heterogeneity across members is therefore an important determinant of macroeconomic volatility. Interestingly, the implications for the committee design under a min-max approach to model uncertainty are identical to those derived from a Bayesian approach.

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File URL: http://www.uni-marburg.de/fb02/makro/forschung/magkspapers/21-2010_tillmann.pdf
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Bibliographic Info

Paper provided by Philipps-Universität Marburg, Faculty of Business Administration and Economics, Department of Economics (Volkswirtschaftliche Abteilung) in its series MAGKS Papers on Economics with number 201021.

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Length: 24 pages
Date of creation: 2010
Date of revision:
Publication status: Forthcoming in
Handle: RePEc:mar:magkse:201021

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Related research

Keywords: Robustness; Model Uncertainty; Monetary Policy Committee; Optimal Monetary Policy;

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  1. Petra Gerlach-Kristen, 2009. "Outsiders at the Bank of England's MPC," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 41(6), pages 1099-1115, 09.
  2. Petra Gerlach-Kristen, 2008. "The Role of the Chairman in Setting Monetary Policy: Individualistic vs. Autocratically Collegial MPCs," International Journal of Central Banking, International Journal of Central Banking, vol. 4(3), pages 119-143, September.
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Cited by:
  1. Berk, Jan Marc & Bierut, Beata K., 2011. "Communication in a monetary policy committee," European Journal of Political Economy, Elsevier, vol. 27(4), pages 791-801.

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