Favorite Betrayal criterion Guide, Meaning , Facts, Information and Description

Definition

A voter optimizes the outcome (from his own perspective) if his vote causes the election of the best possible candidate that can be elected, based on his own preferences, given all the votes cast by other voters.

Statement of Criterion

For any voter who has a unique favorite, there should be no possible set of votes cast by the other voters such that the voter can optimize the outcome (from his own perspective) only by voting someone over his favorite.

Complying Methods

The Approval method complies with the Favorite Betrayal Criterion, while Condorcet method, Cardinal Ratings, Borda count, Plurality voting, and Instant-Runoff Voting do not comply.

Commentary

Election methods that meet this criterion provide no incentive for voters to betray their favorite candidate by voting another candidate over him or her. Although Condorcet technically fails to comply with FBC, the probability is small that a voter can cause a preferable result by not voting for his or her favorite in a Condorcet system.

Some parts of this article are derived with permission from text at http://electionmethods.org

See Also

• Voting system
• Monotonicity criterion
• Condorcet Criterion
• Generalized Condorcet criterion
• Strategy-Free criterion
• Generalized Strategy-Free criterion
• Strong Defensive Strategy criterion
• Weak Defensive Strategy criterion
• Participation criterion
• Summability criterion

• Election Methods Education and Research Group

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