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Set-rationalizable choice and self-stability

机译:可设置合理化的选择和自我稳定

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Rationalizability and similar notions of consistency have proved to be highly problematic in the context of social choice, as witnessed by a range of impossibility results, among which Arrow's is the most prominent. We propose to rationalize choice functions by preference relations over sets of alternatives (set-rationalizability) and introduce two consistency conditions, α and γ, which are defined in analogy to Sen's α and γ. We find that a choice function satisfies α if and only if it is set-rationalizable and that it satisfies α and y if and only if it is self-stable, a new concept based on earlier work by Dutta. The class of self-stable social choice functions contains a number of appealing Condorcet extensions.
机译:事实证明,在社会选择的背景下,合理性和类似的一致性概念存在很大的问题,一系列不可能的结果证明了这一点,其中以阿罗最为突出。我们建议通过对选择集的偏好关系来合理化选择函数(集合合理化),并引入两个一致性条件α和γ,它们类似于Sen的α和γ来定义。我们发现,当且仅当选择函数是可设置合理的时,它才满足α;当且仅当它是自稳定的时,它才满足α和y,这是基于Dutta早期工作的新概念。自稳定的社会选择功能类别包含许多吸引人的Condorcet扩展。

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