Independence of Irrelevant Ballots: Difference between revisions
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'''Independence of Irrelevant Ballots (IIB)''', also known as the '''Blank Ballot Criterion''', says that a voter who has no preference between any candidates should not impact which of them wins or loses by voting. A ''blank ballot'' or ''irrelevant ballot'' is a ballot that fails to indicate any preference between any of the candidates. For ranked-ballot methods, this would mean all candidates are equally ranked or left unranked. For score or graded methods, this would mean that each candidate is given the same bottom-level or positive score/grade. For approval voting, every candidate would be approved or every candidate unapproved.
A generalization of this concept is to treat an irrelevant ballot as simply being a ballot with no preference between the candidates in a set of candidates, and the requirement as being that that ballot shouldn't impact who wins or loses among that set of candidates.
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