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Related Experiment Videos

The unexpected empirical consensus among consensus methods.

Michel Regenwetter1, Aeri Kim, Arthur Kantor

  • 1University of Illinois at Urbana-Champaign, Chapaign, IL 61820, USA. regenwet@uiuc.edu

Psychological Science
|July 7, 2007
PubMed
Summary
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Despite theoretical pessimism, empirical analysis of American Psychological Association elections reveals surprising consensus among Condorcet, Borda, and plurality voting methods, challenging long-held beliefs in social choice theory.

Area of Science:

  • Social Choice Theory
  • Behavioral Economics
  • Psychology

Background:

  • Theoretical social choice literature often emphasizes the nonexistence of a universally optimal voting method, focusing on worst-case scenarios.
  • Behavioral social choice integrates psychological insights to descriptively and empirically study consensus in decision-making processes.

Purpose of the Study:

  • To empirically investigate the degree of consensus among classical social choice procedures.
  • To contrast theoretical predictions with real-world voting behavior in large-scale elections.

Main Methods:

  • Analysis of four American Psychological Association elections with a multimodel, multimethod approach.
  • Determination of election outcomes using Condorcet, Borda, and plurality voting procedures.

Related Experiment Videos

  • Utilizing data reflecting sincere preferences of numerous decision-makers over five alternatives.

    • Main Results:

    • Strong statistical support for an unexpected degree of empirical consensus among the analyzed voting methods.
    • Empirical findings contradict the theoretical literature's depiction of these procedures as irreconcilable.
    • Demonstrated practical agreement between Condorcet, Borda, and plurality methods in real-world elections.

    Conclusions:

    • Empirical evidence suggests greater consensus among social choice procedures than previously assumed.
    • Highlights the necessity for more systematic descriptive and empirical research in social choice theory.
    • Real-world elections may offer valuable data to bridge the gap between theory and practice in voting methods.