Solidarity and efficiency in preference aggregation: A tale of two rules

• 成果类型: Article
• 署名作者: Athanasoglou, Stergios
• 署名单位: University of Milano-Bicocca
• 刊物名称: GAMES AND ECONOMIC BEHAVIOR
• ISSN/ISSBN: 0899-8256
• DOI: 10.1016/j.geb.2019.08.013
• 发表日期: 2019
• 页码: 126-140
• 关键词: Social choice; Preference aggregation; Solidarity; EFFICIENCY; strategy-proofness; Status quo rules

摘要

This paper is concerned with preference-aggregation rules satisfying desirable efficiency and solidarity requirements. We formulate weaker versions of existing solidarity axioms and show how they imply, in conjunction with strategy-proofness, the existence of reference outcomes holding privileged status. We propose a new class of rules, fixed-order status-quo rules, that can be productively contrasted to their closest counterparts in the literature, status-quo rules based on the least upper bound of a lattice. Fixed-order status-quo rules satisfy stronger efficiency requirements than lattice status-quo rules but have weaker, though still significant, solidarity properties. A subfamily based on lexicographic orders is analyzed further. Fixed-order status-quo rules are characterized by strategy-proofness, strong efficiency, and a third axiom, unanimity-basedness. (C) 2019 Elsevier Inc. All rights reserved.