Condorcet vs. Borda in light of a dual majoritarian approach

Eyal Baharad, Shmuel Nitzan

Research output: Contribution to journalArticlepeer-review

Abstract

Many voting rules and, in particular, the plurality rule and Condorcetconsistent voting rules satisfy the simple-majority decisiveness property. The problem implied by such decisiveness, namely, the universal disregard of the preferences of the minority, can be ameliorated by applying unbiased scoring rules such as the classical Borda rule, but such amelioration has a price; it implies erosion in the implementation of the widely accepted "majority principle". Furthermore, the problems of majority decisiveness and of the erosion in the majority principle are not necessarily severe when one takes into account the likelihood of their occurrence. This paper focuses on the evaluation of the severity of the two problems, comparing simple-majoritarian voting rules that allow the decisiveness of the smallest majority larger than 1/2 and the classical Borda method of counts. Our analysis culminates in the derivation of the conditions that determine, in terms of the number of alternatives k, the number of voters n, and the relative (subjective) weight assigned to the severity of the two problems, which of these rules is superior in light of the dual majoritarian approach.

Original languageEnglish
Pages (from-to)151-162
Number of pages12
JournalTheory and Decision
Volume71
Issue number2
Early online date1 Jul 2009
DOIs
StatePublished - Aug 2011

Keywords

  • Condorcet criterion
  • Erosion of majority principle
  • Majority decisiveness
  • The Borda method of counts

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