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Majority Judgment vs Approval Voting

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156940664496778.pdf (445.1Kb)
Date
2019
Notes
Le PDF est une version non publiée datant de 2018.
Dewey
Recherche opérationnelle
Sujet
Majority judgment; majority rule; approval voting; Condorcet consistency; domination paradox; no-show paradox; no-show syndrome
Journal issue
Operations Research
Publication date
2019
Forthcoming
oui
URI
https://basepub.dauphine.fr/handle/123456789/19918
Collections
  • LAMSADE : Publications
Metadata
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Author
Balinski, Michel
2579 Centre de Recherche en Économie et Statistique [CREST]
Laraki, Rida
989 Laboratoire d'analyse et modélisation de systèmes pour l'aide à la décision [LAMSADE]
Type
Article accepté pour publication ou publié
Abstract (EN)
Majority judgment (MJ) and approval voting (AV) are compared in theory and practice. Criticisms of MJ and claims that AV is superior are refuted. The two primary criticisms have been that MJ is not "Condorcet-consistent" and that it admits the "no-show" paradox. That MJ is not Condorcet-consistent is a good property shared with AV: the domination paradox shows majority rule may well err in an election between two. Whereas the no-show paradox is in theory possible with MJ it is as a practical matter impossible. For those who believe this extremely rare phenomenon is important it is proven that MJ with three grades cannot admit the no-show paradox. In contrast; AV suffers from serious drawbacks because voters can only "tick" or "approve" candidates at best only Approve or Disapprove each candidate. With AV voters cannot express their opinions adequately; experiments show that Approve is not the opposite of Disapprove; and although AV does not admit the no-show paradox it admits the very closely allied "no-show syndrome and insensitivity." Two is too few. Substantive debate must concern three or more grades.

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