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Encyclopedia > Copeland's method

Copeland's method is a Condorcet method in which the winner is determined by finding the candidate with the most pairwise victories. Any election method conforming to the Condorcet criterion is known as a Condorcet method. ...

Proponents argue that this method is more understandable to the general populace, which is generally familiar with the sporting equivalent. In many team sports, the teams with the greatest number of victories in regular season matchups make it to the playoffs.

This method leads to ties in cases where the outcome is different than in Condorcet's method (i.e. when there are multiple members of the Smith set). Critics argue that it also puts too much emphasis on the quantity of pairwise victories rather than the magnitude of those victories (or conversely, of the defeats). In voting systems, the Smith set is the smallest set of candidates in a particular election who, when paired off in pairwise elections, can beat all other candidates outside the set. ...

See also

Politics is the process and method of gaining or maintaining support for public or common action: the conduct of decision-making for groups. ... Voters at the voting booths in the US in 1945 Voting systems are methods (algorithms) for groups of people to select one or more options from many, taking into account the individual preferences of the group members. ...

External references

  1. E Stensholt, "Nonmonotonicity in AV (http://www.electoral-reform.org.uk/publications/votingmatters/P2.HTM)"; Electoral Reform Society Voting matters - Issue 15, June 2002 (online).
  2. A.H. Copeland, A 'reasonable' social welfare function, Seminar on Mathematics in Social Sciences, University of Michigan, 1951.
  3. V.R. Merlin, and D.G. Saari, "Copeland Method. II. Manipulation, Monotonicity, and Paradoxes"; Journal of Economic Theory; Vol. 72, No. 1; January, 1997; 148-172.
  4. D.G. Saari. and V.R. Merlin, 'The Copeland Method. I. Relationships and the Dictionary'; Economic Theory; Vol. 8, No. l; June, 1996; 51-76.



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