Relating Metric Distortion and Fairness of Social Choice Rules
Relating Metric Distortion and Fairness of Social Choice Rules
复制标题
将度量扭曲与社会选择规则的公平性联系起来
DOI:
10.1145/3230654.3230658
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Krishnaswamy, Anilesh K.
中科院分区:
文献类型:
--
作者:
Goel, Ashish;Hulett, Reyna;Krishnaswamy, Anilesh K.
Voting is at the core of many important decisions, not least the election of government officials. Voting, or social choice, theory studies the aggregation of agent preferences into a single collective decision via a social choice rule. Usually, each agent submits a ranking over the candidates, and a social choice rule maps any instance of these preferences to one or more alternatives. But how do we choose the social choice rule? Traditionally, these rules have been evaluated based on simple axiomatic criteria—eg, the majority winner criterion—but unfortunately even small sets of axioms can be impossible to satisfy simultaneously. A more recent approach goes beyond axioms to take a utilitarian view of social choice. In this model, although agents express their preferences via an ordinal ranking, they are assumed to have latent cardinal preferences over the alternatives. In the metric distortion model [1], we assume that the agents and alternatives lie in an arbitrary, unknown metric space, and an agent’s cost for an alternative equals the distance between the two. With only this simple assumption, it has been shown that some social choice rules, like Copeland, can achieve a constant factor distortion—that is, the worst-case ratio of the social cost of the chosen candidate to that of the optimal candidate chosen omnisciently [1]. Within the metric distortion framework, we can also ask how quantitatively “fair” a social choice rule is. To this end, we consider the fairness ratio [2], which is a simultaneous bound, over all k, on the ratio of the k largest agent costs for the chosen candidate
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DOI:
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发表时间:
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期刊:
EC '17 Proceedings of the 2017 ACM Conference on Economics and Computation
影响因子:
--
作者:
Goel, Ashish;Krishnaswamy, Anilesh K.;Munagala, Kamesh
通讯作者:
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