Sequential Deliberation for Social Choice

Sequential Deliberation for Social Choice
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社会选择的顺序审议

DOI:
10.1007/978-3-319-71924-5_13
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发表时间:
2017
期刊:
International Conference on Web and Internet Economics
影响因子:
--
通讯作者:
Sakshuwong, S.
Sakshuwong, S.
中科院分区:
--
文献类型:
--
作者:
Fain, B;Goel, A;Munagala, K;Sakshuwong, S.

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社会选择是一个规范性的研究设计协议的集体决策。然而,在基础决策空间对于顺序投票来说太大或太复杂的情况下,标准投票方法可能是不切实际的。那么,我们如何设计一个协议--最好是去中心化的、简单的、可扩展的,并且不需要任何关于决策空间的特殊知识--来达成共识呢?我们建议顺序审议作为这个问题的自然解决方案。在这种迭代方法中,连续对代理讨价还价的决策空间使用以前的决定作为一个分歧的选择。我们表明,顺序审议发现一个1.208近似的最佳社会成本时,空间的偏好定义一个中位数图,非常接近这个值,只有一个小的常数数量的代理人从人口中抽样。我们还给出了更简单的机制类的下限,以证明我们的设计选择。我们进一步表明,顺序审议是事后帕累托有效的,并有真实的报告作为一个均衡的诱导广泛的形式游戏。最后,我们证明了在一般度量空间中,序列审议结果的社会成本分布的一阶矩和二阶矩也是有界的。
Social choice is a normative study of designing protocols for collective decision making. However, in instances where the underlying decision space is too large or complex for ordinal voting, standard voting methods may be impractical. How then can we design a protocol - preferably decentralized, simple, scalable, and not requiring any special knowledge of the decision space - to reach consensus? We propose sequential deliberation as a natural solution to this problem. In this iterative method, successive pairs of agents bargain over the decision space using the previous decision as a disagreement alternative. We show that sequential deliberation finds a 1.208-approximation to the optimal social cost when the space of preferences define a median graph, coming very close to this value with only a small constant number of agents sampled from the population. We also give lower bounds on simpler classes of mechanisms to justify our design choices. We further show that sequential deliberation is ex-post Pareto efficient and has truthful reporting as an equilibrium of the induced extensive form game. Finally, we prove that for general metric spaces, the first and second moment of the distribution of social cost of the outcomes produced by sequential deliberation are also bounded by constants.
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