Group Fairness: From Multiwinner Voting to Participatory Budgeting (Invited Talk)

Author Edith Elkind

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Edith Elkind
  • University of Oxford, UK
  • Alan Turing Institute, London, UK

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Edith Elkind. Group Fairness: From Multiwinner Voting to Participatory Budgeting (Invited Talk). In 34th International Symposium on Algorithms and Computation (ISAAC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 283, pp. 1:1-1:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)


Many cities around the world allocate a part of their budget based on residents' votes, following a process known as participatory budgeting. It is important to understand which outcomes of this process should be viewed as fair, and whether fair outcomes could be computed efficiently. We summarise recent progress on this topic. We first focus on a special case of participatory budgeting where all candidate projects have the same cost (known as multiwinner voting), formulate progressively more demanding notions of fairness for this setting, and identify efficiently computable voting rules that satisfy them. We then discuss the challenges of extending these ideas to the general model.

Subject Classification

ACM Subject Classification
  • Applied computing
  • multiwinner voting
  • participatory budgeting
  • justified representation


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  1. Haris Aziz, Markus Brill, Vincent Conitzer, Edith Elkind, Rupert Freeman, and Toby Walsh. Justified representation in approval-based committee voting. Social Choice and Welfare, 48(2):461-485, 2017. Google Scholar
  2. Haris Aziz, Edith Elkind, Shenwei Huang, Martin Lackner, Luis Sánchez-Fernández, and Piotr Skowron. On the complexity of extended and proportional justified representation. In AAAI'18, 2018. Google Scholar
  3. Haris Aziz and Nisarg Shah. Participatory budgeting: Models and approaches. Pathways Between Social Science and Computational Social Science: Theories, Methods, and Interpretations, pages 215-236, 2021. Google Scholar
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  6. D. Marc Kilgour. Approval balloting for multi-winner elections. In Handbook on Approval Voting, pages 105-124. Springer, 2010. Google Scholar
  7. Sonja Kraiczy and Edith Elkind. An adaptive and verifiably proportional method for participatory budgeting. In WINE'23, 2023. Google Scholar
  8. Dominik Peters, Grzegorz Pierczyński, and Piotr Skowron. Proportional participatory budgeting with additive utilities. In NeurIPS'21, pages 12726-12737, 2021. Google Scholar
  9. Dominik Peters and Piotr Skowron. Proportionality and the limits of welfarism. In ACM EC'20, pages 793-794, 2020. Google Scholar
  10. Luis Sánchez-Fernández, Edith Elkind, Martin Lackner, Norberto Fernández, Jesús Fisteus, Pablo Basanta Val, and Piotr Skowron. Proportional justified representation. In AAAI'17, pages 670-676, 2017. Google Scholar
  11. Brian Wampler, Stephanie McNulty, and Michael Touchton. Participatory budgeting in global perspective. Oxford University Press, 2021. Google Scholar
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