Exploring the No-Show Paradox for Condorcet Extensions

Felix Brandt (), Johannes Hofbauer () and Martin Strobel ()
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Felix Brandt: Technische Universität München
Johannes Hofbauer: Technische Universität München
Martin Strobel: National University of Singapore

A chapter in Evaluating Voting Systems with Probability Models, 2021, pp 251-273 from Springer

Abstract: Abstract An important and surprising phenomenon in voting theory is the No-Show Paradox (NSP), which occurs if a voter is better off by abstaining from an election. While it is known that certain voting rules suffer from this paradox in principle, the extent to which it is of practical concern is not well understood. We aim at filling this gap by analyzing the likelihood of the NSP for six Condorcet extensions (Black’s rule, Baldwin’s rule, Nanson’s rule, Max-Min, Tideman’s rule, and Copeland’s rule) under various preference models using Ehrhart theory as well as extensive computer simulations. We find that, for few alternatives, the probability of the NSP is rather small (less than 4% for four alternatives and all considered preference models, except for Copeland’s rule). As the number of alternatives increases, the NSP becomes much more likely and which rule is most susceptible to abstention strongly depends on the underlying distribution of preferences.

Date: 2021
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DOI: 10.1007/978-3-030-48598-6_11

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