The Condorcet Paradox Revisited

P. Jean-Jacques Herings*, H Houba

*Corresponding author for this work

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Abstract

We analyze the Condorcet paradox within a strategic bargaining model with majority voting, exogenous recognition probabilities, and no discounting for the case with three players and three alternatives. Stationary subgame perfect equilibria (SSPE) exist whenever the geometric mean of the players' risk coefficients, ratios of utility differences between alternatives, is at most one. SSPEs ensure agreement within finite expected time. For generic parameter values, SSPEs are unique and exclude Condorcet cycles. In an SSPE, at least two players propose their best alternative and at most one player proposes his middle alternative with positive probability. Players never reject best alternatives, may reject middle alternatives with positive probability, and reject worst alternatives. Recognition probabilities represent bargaining power and drive expected delay. Irrespective of utilities, no delay occurs for suitable distributions of bargaining power, whereas expected delay goes to infinity in the limit where one player holds all bargaining power. An increase in the recognition probability of a player may weaken his bargaining position. A player weakly improves his bargaining position when his risk coefficient decreases.

Original languageEnglish
Pages (from-to)141-186
Number of pages46
JournalSocial Choice and Welfare
Volume47
Issue number1
DOIs
Publication statusPublished - Jun 2016

Keywords

  • STOCHASTIC GAMES
  • MAJORITY-RULE
  • PERFECT EQUILIBRIUM
  • NOWHERE DENSENESS
  • BARGAINING MODEL
  • VOTING MODELS
  • INTRANSITIVITIES
  • INFORMATION
  • CORE

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