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Barton E. Lee

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2 papers

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AAAI Conference 2021 Conference Paper

Proportionally Representative Participatory Budgeting with Ordinal Preferences

Haris Aziz
Barton E. Lee

Participatory budgeting (PB) is a democratic paradigm whereby voters decide on a set of projects to fund with a limited budget. We consider PB in a setting where voters report ordinal preferences over projects and have (possibly) asymmetric weights. We propose proportional representation axioms and clarify how they fit into other preference aggregation settings, such as multi-winner voting and approvalbased multi-winner voting. As a result of our study, we also discover a new solution concept for approval-based multiwinner voting, which we call Inclusion PSC (IPSC). IPSC is stronger than proportional justified representation (PJR), incomparable to extended justified representation (EJR), and yet compatible with EJR. The well-studied Proportional Approval Voting (PAV) rule produces a committee that satisfies both EJR and IPSC; however, both these axioms can also be satisfied by an algorithm that runs in polynomial-time.

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AAMAS Conference 2018 Conference Paper

Proportionally Representative Participatory Budgeting: Axioms and Algorithms

Haris Aziz
Barton E. Lee
Nimrod Talmon

Participatory budgeting is one of the exciting developments in deliberative grassroots democracy. We concentrate on approval elections and propose proportional representation axioms in participatory budgeting, by generalizing relevant axioms for approvalbased multi-winner elections. We observe a rich landscape with respect to the computational complexity of identifying proportional budgets and computing such, and present budgeting methods that satisfy these axioms by identifying budgets that are representative to the demands of vast segments of the voters.

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