Proxy selection in transitive proxy voting

Jacqueline Harding ()
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Jacqueline Harding: Stanford University

Social Choice and Welfare, 2022, vol. 58, issue 1, No 4, 69-99

Abstract: Abstract Transitive proxy voting (or ‘liquid democracy’) is a novel form of collective decision making, often framed as an attractive hybrid of direct and representative democracy. Although the ideas behind liquid democracy have garnered widespread support, there have been relatively few attempts to model it formally. This paper makes three main contributions. First, it proposes a new social choice-theoretic model of liquid democracy, which is distinguished by taking a richer formal perspective on the process by which a voter chooses a proxy. Second, it examines the model from an axiomatic perspective, proving (a) a proxy vote analogue of May’s Theorem and (b) an impossibility result concerning monotonicity properties in a proxy vote setting. Third, it explores the topic of manipulation in transitive proxy votes. Two forms of manipulation specific to the proxy vote setting are defined, and it is shown that manipulation occurs in strictly more cases in proxy votes than in classical votes.

Date: 2022
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DOI: 10.1007/s00355-021-01345-8

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