{"type":"ScholarlyArticle","title":"Deliberation and Voting in Approval-Based Multi-Winner Elections","authors":[{"name":"Kanav Mehra","slug":"kanav-mehra","given":"Kanav","family":"Mehra","affiliation":"School of Computer Science , University of Waterloo"},{"name":"Nanda Kishore Sreenivas","slug":"nanda-kishore-sreenivas","given":"Nanda Kishore","family":"Sreenivas","affiliation":"School of Computer Science , University of Waterloo"},{"name":"Kate Larson","slug":"kate-larson","given":"Kate","family":"Larson","affiliation":"School of Computer Science , University of Waterloo"}],"abstract":"Citizen-focused democratic processes where participants deliberate on alternatives and then vote to make the final decision are increasingly popular today. While the computational social choice literature has extensively investigated voting rules, there is limited work that explicitly looks at the interplay of the deliberative process and voting. In this paper, we build a deliberation model using established models from the opinion-dynamics literature and study the effect of different deliberation mechanisms on voting outcomes achieved when using well-studied voting rules. Our results show that deliberation generally improves welfare and representation guarantees, but the results are sensitive to how the deliberation process is organized. We also show, experimentally, that simple voting rules, such as approval voting, perform as well as more sophisticated rules such as proportional approval voting or method of equal shares if deliberation is properly supported. This has ramifications on the practical use of such voting rules in citizen-focused democratic processes.","doi":"10.24963/ijcai.2023/318","url":"https://ijcai.org/proceedings/2023/318","pdf":"https://ijcai.org/proceedings/2023/0318.pdf","markdown":"https://ijcai.org/proceedings/2023/318.md","bibtex":"https://ijcai.org/proceedings/2023/bibtex/318","volume":{"slug":"2023","title":"Proceedings of the Thirty-Second International Joint Conference on Artificial Intelligence","short_title":"IJCAI 2023","url":"https://ijcai.org/proceedings/2023/","year":2023,"location":"Macao, SAR","dates":"19-25 August 2023","editors":"Edith Elkind","isbn":"978-1-956792-03-4","publisher":"International Joint Conferences on Artificial Intelligence Organization","doi_prefix":"10.24963/ijcai.2023"},"section":"Game Theory and Economic Paradigms","track":"Main Track","number":318,"pages":{"first":2853,"last":2861},"keywords":["Agent-based and Multi-agent Systems: MAS: Agent-based simulation and emergence","Game Theory and Economic Paradigms: GTEP: Computational social choice"],"videos":[],"references":[{"position":1,"raw":"[Aziz and Shah, 2021] Haris Aziz and Nisarg Shah. 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