nep-cdm New Economics Papers
on Collective Decision-Making
Issue of 2006‒03‒05
three papers chosen by
Marco Novarese
Universita del Piemonte Orientale

  1. Separation of decision in group identification By Miller, Alan D.
  2. Central Banking by Committee By Anne Sibert
  3. Monetary Policy by Committee: Why and How? By Alan Blinder

  1. By: Miller, Alan D.
  2. By: Anne Sibert
    Abstract: There is a small, but growing, economics literature on the importance and effects of having monetary policy made by a committee, rather than by an individual. Complimenting this is an older and larger body of literature on groups in the other social sciences, particular in social psychology. This paper provides a review of some of this work, focusing on two important features of committees: the effect of their size on performance and whether or not they are more moderate than the members who make them up. Individual members of a committee acquire idiosyncratic information which the committee uses to make a decision. A result of the famous Condorcet Jury Theorem is that larger committees have more resources, in the form of more information, and are thus better than smaller ones. This result depends on individuals being willing to work as hard at gathering information when they are members of a committee as they would be willing to work if they were acting alone. The economics literature suggests that this may not hold; that individual members may have an incentive to shirk. This phenomenon of a member withholding effort is called social loading in the social pyschology literature. Studies stretching over 125 years document its existence and suggest that it becomes more important as committee size increases and that it disappears when individual members contributions can be identified and evaluated. The Condorcet Jury Theorem also depends on the committee being able to aggregate members information and on members being willing to truthfully reveal their information. An excessively formal meeting structure may cause the former to fail to hold; committee members with different objectives may cause the latter not to be true. As a result of shirking and coordination problems, smaller committees may be better than larger ones and the optimal size for a committee is an empirical issue. Committees pool members information and views, thus it seems that monetary policy made by a committee should be more moderate than monetary policy made by a single individual. However, several hundred studies demonstrate that belonging to a committee polarizes its members and, hence, committees may be more extreme than individuals. A particularly harmful form of group polarization occurs when committee members striving for consensus causes them to stop paying suffcient attention to alternative courses of action. In this case the committee may make terrible decisions that none of its members would have made on their own. The results of the literature on committee size and committee polarization suggest that the ideal monetary policy committee may not have many more than five members. It should have a well defined objective and it should publish the votes of its members. It should be structured so that members do not act as part of a group, perhaps by having short terms in office and members from outside the central bank. External scrutiny of the decision-making process should be encouraged.
    Keywords: committees; monetary policy.
    JEL: E58 C92 D71
    Date: 2006–02
  3. By: Alan Blinder
    Abstract: Among the most notable, but least discussed, hallmarks of what I have called the "quiet revolution" in central banking practice (Blinder, 2004a) has been the movement toward making monetary policy decisions by committee. Until about a decade ago, most central banks had a single governor, who might or might not have been independent of the rest of the government. But since then, the United Kingdom, Japan, Sweden, Norway, Switzerland, and Brazil, to name just a few, have opted to establish monetary policy committees (MPCs). In addition, the committee-based ECB replaced 12 central banks, most of which had previously been run by individual governors. Thus the existence of a pronounced worldwide trend is clear. In this paper, I discuss two questions. The first question is why. Why have so many central banks switched from individual to group decisionmaking? The second question is how. How should central banks make decisions and how should they communicate with the public, the government, and the markets?
    Keywords: central banks; committees; voting; communication.
    JEL: E58 D71 D78
    Date: 2006–02

This nep-cdm issue is ©2006 by Marco Novarese. It is provided as is without any express or implied warranty. It may be freely redistributed in whole or in part for any purpose. If distributed in part, please include this notice.
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