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Minimax Analysis of Monetary Policy Under Model Uncertainty


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  • Alexei Onatski

    (Harvard University)


Recently there have been several studies that examined monetary policy under model uncertainty. These studies formulated uncertainty in a number of different ways. One of the prominent ways to formulate model uncertainty is to form a non-parametric set of perturbations around some nominal model where the set is structured so that the uncertainty is focused on potentially important weaknesses of the model. Unfortunately, previous efforts were unable to compute exact optimal policy rules under this general formulation of uncertainty. Moreover, for those special cases when the robust rules were computed, the degree of their aggressiveness was often counterintuitive in light of conventional Brainard/Bayesian wisdom that policy under uncertainty should be conservative. This paper,therefore, consists of three different exercises concerning minimax analysis of policy rules under model uncertainty. First, the minimax approach is compared with the Bayesian one in a stylized Brainard (1967) setting. Strong similarities between recommendations of the two approaches are found. Next, a more realistic setting such as in Onatski and Stock (1999) is considered. A characterization of the worst possible models corresponding to the max part of the minimax scheme is given. It is shown that the worst possible models for very aggressive rules, such as the H-infinity rule, have realistic economic structure whereas those for passive rules, such as the actual Fed's policy, are not plausible. Thus, the results of minimax analysis presented in Onatski and Stock (1999) might be biased against the passive rules. Finally, exact optimal minimax policy rules for the case of slowly time-varying uncertainty in the case of the Rudebusch and Svensson's (1998) model are computed. The optimal rule under certainty turns out to be robust to moderate deviations from Rudebusch and Svensson's model.

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Bibliographic Info

Paper provided by Econometric Society in its series Econometric Society World Congress 2000 Contributed Papers with number 1818.

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Date of creation: 01 Aug 2000
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Handle: RePEc:ecm:wc2000:1818

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  1. Rudebusch, G.D. & Svensson, L.E.O., 1998. "Policy Rules for Inflation Targeting," Papers 637, Stockholm - International Economic Studies.
  2. Alexei Onatski & James H. Stock, 2000. "Robust Monetary Policy Under Model Uncertainty in a Small Model of the U.S. Economy," NBER Working Papers 7490, National Bureau of Economic Research, Inc.
  3. Alan S. Blinder, 1999. "Central Banking in Theory and Practice," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262522608, December.
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Cited by:
  1. Adam, Klaus, 2004. "On the relation between robust and Bayesian decision making," Journal of Economic Dynamics and Control, Elsevier, vol. 28(10), pages 2105-2117, September.
  2. Stefano Eusepi, 2004. "Does Central Bank Transparency Matter for Economic Stability," Computing in Economics and Finance 2004 176, Society for Computational Economics.
  3. Olga Kuznetsova, 2012. "Robust Monetary Policy in a Currency Union," Panoeconomicus, Savez ekonomista Vojvodine, Novi Sad, Serbia, vol. 59(2), pages 185-199, May.


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