Barriers to Manipulation in Voting

نویسندگان

  • Vincent Conitzer
  • Toby Walsh
چکیده

Example 6.1 Consider an election with three alternatives, a, b, and c, and three voters, 1, 2, and 3. Suppose the rule used is plurality—an alternative gets a point each time it is ranked first by a voter, and the alternative with the most points wins—with ties broken towards alternatives earlier in the alphabet. Suppose voter 3 knows (or strongly suspects) that voter 1 will rank a first in her vote, and that voter 2 will rank b first. Voter 3’s true preferences are c b a. If she votes truthfully, this will result in a three-way tie, broken in favor of a which is 3’s least preferred alternative. If, instead, voter 3 ranks b first, then b will win instead. Hence, voter 3 has an incentive to cast a vote that does not reflect her true preferences.

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تاریخ انتشار 2016