Lec 4 - Indeterminancy with >2 Alternatives 1/22/09 More...

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Indeterminancy with >2 Alternatives 1/22/09
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More Fairness Criteria Monotonicity Undifferentiatedness Nuetrality Condorcet: If an alternative beats all others in pairwise voting, it ought to win Consistency: If an alternative is a true winner, subdividing the electorate should not make it a loser Independence from Irrelevant Alternatives: The winning alternative should not depend on the presence, absence of position of irrelevant alternatives.
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Unfairness of Decisions for >2 Alternatives Review: With >2 alternatives Condorcet winner may not exist Even if Cond. winner exists, some rules might select other alternatives (Paradox of voting)
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Rank Order 35% of voters 25% of voters 20% of voters 20% of voters 1 Humphrey (D) Coleman (R) Ventura Ventura 2 Coleman (R) Humphrey (D) Humphrey (D) Coleman (R) 3 Ventura Ventura Coleman (R) Humphrey (D)
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>2 Alternatives: Majoritarian Methods Amendment procedure Violated neutrality
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This note was uploaded on 02/17/2009 for the course POLISCI 389 taught by Professor Allenhicken during the Winter '09 term at University of Michigan.

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Lec 4 - Indeterminancy with >2 Alternatives 1/22/09 More...

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