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Domains, ranges and strategy-proofness: the case of single-dipped preferences

机译:领域,范围和策略证明:单浸偏好

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摘要

We characterize the set of all individual and group strategy-proof rules on the domain of all single-dipped preferences on a line. For rules defined on this domain, and on several of its subdomains, we explore the implications of these strategy-proofness requirements on the maximum size of the rules’ range. We show that when all single-dipped preferences are admissible, the range must contain two alternatives at most. But this bound changes as we consider different subclasses of single-dipped preferences: we provide examples of subdomains admitting strategy-proof rules with larger ranges. We establish exact bounds on the maximal size of strategy-proof functions on each of these domains, and prove that the relationship between the sizes of the subdomains and those of the ranges of strategy-proof functions on them need not be monotonic. Our results exhibit a sharp contrast between the structure of strategy-proof rules defined on subdomains of single-dipped preferences and those defined on subsets of single-peaked ones.
机译:我们在一条线上的所有单浸首选项的范围内,刻画所有个人和组策略证明规则的集合。对于在此域及其多个子域中定义的规则,我们探索了这些策略验证要求对规则范围的最大大小的影响。我们表明,当所有单首选项都可接受时,该范围最多必须包含两个替代项。但是随着我们考虑单浸入偏好的不同子类时,这种界限发生了变化:我们提供了子域的示例,这些子域允许更大范围的策略证明规则。我们在每个域上的策略证明函数的最大大小上确定了精确的界限,并证明子域的大小与策略证明函数的范围之间的关系不必是单调的。我们的结果显示了在单次浸入偏好的子域上定义的策略证明规则结构与在单峰偏好的子集上定义的策略证明规则结构之间的鲜明对比。

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  • 来源
    《Social Choice and Welfare》 |2012年第3期|335-352|共18页
  • 作者单位

    MOVE Universitat Autònoma de Barcelona Barcelona GSE Edifici B 08193 Bellaterra Spain;

    Departament d’Economia Campus de Montilivi Universitat de Girona 17071 Girona Spain;

    Departamento de Teoría e Historia Económica Facultad de Ciencias Económicas y Empresariales Campus de El Ejido 29071 Málaga Spain;

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