Approval with Runoff

Approval with Runoff

Théo Delemazure, Jérôme Lang, Jean-François Laslier, M. Remzi Sanver

Proceedings of the Thirty-First International Joint Conference on Artificial Intelligence
Main Track. Pages 230-236. https://doi.org/10.24963/ijcai.2022/33

We define a family of runoff rules that work as follows: voters cast approval ballots over candidates; two finalists are selected; and the winner is decided by majority. With approval-type ballots, there are various ways to select the finalists. We leverage known approval-based committee rules and study the obtained runoff rules from an axiomatic point of view. Then we analyze the outcome of these rules on single-peaked profiles, and on real data.
Keywords:
Agent-based and Multi-agent Systems: Computational Social Choice