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Distance rationalizability of scoring rules

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  • Can B.

    (GSBE)

Abstract

Collective decision making problems can be seen as finding an outcome that is closest to a concept of consensus. 1 introduced Closeness to Unanimity Procedure as a first example to this approach and showed that the Borda rule is the closest to unanimity under swap distance a.k.a the 2 distance. 3 shows that the Dodgson rule is the closest to Condorcet under swap distance. 4, 5 generalized this concept as distance-rationalizability, where being close is measured via various distance functions and with many concepts of consensus, e.g., unanimity, Condorcet etc. In this paper, we show that all non-degenerate scoring rules can be distance-rationalized as Closeness to Unanimity procedures under a class of weighted distance functions introduced in 6. Therefore, the results herein generalizes 1 and builds a connection between scoring rules and a generalization of the Kemeny distance, i.e. weighted distances.

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Bibliographic Info

Paper provided by Maastricht University, Graduate School of Business and Economics (GSBE) in its series Research Memorandum with number 068.

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Date of creation: 2013
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Handle: RePEc:unm:umagsb:2013068

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Keywords: Computational Techniques; Simulation Modeling; Social Choice; Clubs; Committees; Associations; Political Processes: Rent-seeking; Lobbying; Elections; Legislatures; and Voting Behavior; Conflict; Conflict Resolution; Alliances;

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