Deliberation and Voting Rules

We analyze a formal model of decision-making by a deliberative committee. There is a given binary agenda. Individuals evaluate the two alternatives on both private and common interest grounds. Each individual has two sorts of private information going into committee: (a) perfect information about their personal bias and (b) noisy information about which alternative is best with respect to a (commonly held) normative criterion. Prior to a committee vote to choose an alternative, committee members engage in deliberation, modeled as a simultaneous cheap-talk game. We explore and compare equilibrium properties under majority and unanimity voting rules, paying particular attention to the character of debate (who influences who and how) and quality of the decision in each instance. On balance, majority rule induces more information sharing and fewer decision-making errors than unanimity. Furthermore, the influence and character of deliberation per se can vary more under majority rule than under unanimity.

[1]  Marco Battaglini,et al.  Multiple Referrals and Multidimensional Cheap Talk , 2002 .

[2]  Dennis F. Thompson,et al.  Moral Disagreement in a Democracy , 1995, Social Philosophy and Policy.

[3]  Peter J. Coughlan.  In Defense of Unanimous Jury Verdicts: Mistrials, Communication, and Strategic Voting , 2000, American Political Science Review.

[4]  A. McLennan.  Consequences of the Condorcet Jury Theorem for Beneficial Information Aggregation by Rational Agents , 1998, American Political Science Review.

[5]  Amitai Etzioni.  The Good Polity , 1991 .

[6]  D. Austen-Smith.  Interested Experts and Policy Advice: Multiple Referrals under Open Rule , 1993 .

[7]  Robert Sugden,et al.  Condorcet: Foundations of Social Choice and Political Theory , 1994 .

[8]  C. List,et al.  Social Choice Theory and Deliberative Democracy: A Reconciliation , 2002, British Journal of Political Science.

[9]  Credible debate equilibria , 1990 .

[10]  John Duggan,et al.  A Bayesian Model of Voting in Juries , 2001, Games Econ. Behav..

[11]  Oliver P. Shiras.  The Jury System , 1891 .

[12]  K. Ladha.  The Condorcet Jury Theorem, Free Speech and Correlated Votes , 1992 .

[13]  Adam Meirowitz,et al.  In Defense of Exclusionary Deliberation: Communication and Voting with Private Beliefs and Values , 2007 .

[14]  J. Elster,et al.  Foundations of Social Choice Theory , 1986 .

[15]  Dino Gerardi,et al.  Putting Your Ballot Where Your Mouth Is: An Analysis of Collective Choice with Communication , 2003 .

[16]  William A. Barnett,et al.  Political Economy: Institutions, Competition and Representation , 1993 .

[17]  J. Bohman,et al.  Deliberative Democracy: Essays on Reason and Politics , 1997 .

[18]  Joshua Cohen,et al.  DELIBERATION AND DEMOCRATIC LEGITIMACY , 2005, Philosophy, Politics, Democracy.

[19]  Dino Gerardi,et al.  Communication and Voting with Double-Sided Information , 2003 .

[20]  T. Feddersen,et al.  The Swing Voter's Curse , 1996 .

[21]  P. Sørensen,et al.  Information aggregation in debate: who should speak first? ☆ , 2001 .

[22]  T. Feddersen,et al.  Voting Behavior and Information Aggregation in Elections with Private Information , 1997 .

[23]  D. Austen-Smith.  Information transmission in debate , 1990 .

[24]  C. Sunstein.  Democracy and Shifting Preferences , 1993 .

[25]  Joseph Farrell.  Meaning and Credibility in Cheap-Talk Games , 1993 .

[26]  Joseph Farrell.  Cheap Talk, Coordination, and Entry , 1987 .

[27]  Ariel Rubinstein,et al.  Debates and Decisions: On a Rationale of Argumentation Rules , 2001, Games Econ. Behav..

[28]  Matthew Rabin,et al.  A Model of Pre-game Communication , 1991 .

[29]  David Austen-Smith.  Information acquisition and orthogonal argument , 1993 .

[30]  J. Morgan,et al.  A Model of Expertise , 1999 .

[31]  Stanley Reiter,et al.  The economics of informational decentralization : complexity, efficiency, and stability : essays in honor of Stanley Reiter , 1994 .

[32]  Jon Elster,et al.  THE MARKET AND THE FORUM : Three varieties of political theory , 2005 .

[33]  Andrew Postlewaite,et al.  On Modeling Cheap Talk in Bayesian Games , 1995 .

[34]  Bernard Manin,et al.  On Legitimacy and Political Deliberation , 1987 .

[35]  Edi Karni,et al.  Individual Sense of Justice: A Utility Representation , 2002 .

[36]  Barton L. Lipman,et al.  Current Draft , 1994 .

[37]  Daniel Diermeier,et al.  Information and Congressional Hearings , 2000 .

[38]  David Miller,et al.  Deliberative Democracy and Social Choice , 1992 .