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Distance rationalizability of scoring rules

Working paper
Author/s: 
Burak Can
Issue number: 
68/2013
Series: 
GSBE
Publisher: 
Maastricht University
Year: 
2013
PDF [1]
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.
Tags: 
Social Choice [2]

Source URL:http://coalitiontheory.net/content/distance-rationalizability-scoring-rules

Links
[1] http://digitalarchive.maastrichtuniversity.nl/fedora/get/guid:b4a7f598-9999-483d-bf7d-a7b720483710/ASSET1 [2] http://coalitiontheory.net/research-areas/social-choice