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- W1569337322 abstract "In their groundbreaking paper, Bartholdi, Tovey and Trick [1] argued that many well-known voting rules, such as Plurality, Borda, Copeland and Maximin are easy to manipulate. An important assumption made in that paper is that the manipulator's goal is to ensure that his preferred candidate is among the candidates with the maximum score, or, equivalently, that ties are broken in favor of the manipulator's preferred candidate. In this paper, we examine the role of this assumption in the easiness results of [1]. We observe that the algorithm presented in [1] extends to all rules that break ties according to a fixed ordering over the candidates. We then show that all scoring rules are easy to manipulate if the winner is selected from all tied candidates uniformly at random. This result extends to Maximin under an additional assumption on the manipulator's utility function that is inspired by the original model of [1]. In contrast, we show that manipulation becomes hard when arbitrary polynomial-time tie-breaking rules are allowed, both for the rules considered in [1], and for a large class of scoring rules." @default.
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- W1569337322 date "2011-05-02" @default.
- W1569337322 modified "2023-09-24" @default.
- W1569337322 title "Ties matter: complexity of voting manipulation revisited" @default.
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- W1569337322 doi "https://doi.org/10.5555/2030470.2030481" @default.
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