Design on Matroids: Diversity vs. Meritocracy

📅 2022-12-31
📈 Citations: 4
✨ Influential: 1
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🤖 AI Summary
This paper addresses the dual-objective optimization problem of simultaneously ensuring diversity and selecting high-ability candidates—e.g., in university admissions—by maximizing aggregate candidate quality subject to a given diversity constraint. Method: We formulate this trade-off as a Pareto frontier search problem and, for the first time, provide two novel axiomatizations grounded in matroid theory. Integrating combinatorial optimization with mechanism design, we develop an algorithmic framework capable of both satisfying hard diversity constraints and enumerating the complete Pareto-optimal set. Contribution/Results: Our method exactly computes all diversity–quality Pareto-optimal subsets, accompanied by theoretical guarantees of optimality. It establishes a rigorous mathematical foundation for designing fair, transparent, and verifiable selection algorithms—advancing principled approaches to equitable resource allocation under structural constraints.
📝 Abstract
We provide optimal solutions to an institution that has dual goals of diversity and meritocracy when choosing from a set of applications. For example, in college admissions, administrators may want to admit a diverse class in addition to choosing students with the highest qualifications. We provide a class of choice rules that maximize merit subject to attaining a diversity level. Using this class, we find all subsets of applications on the diversity-merit Pareto frontier. In addition, we provide two novel characterizations of matroids.
Problem

Research questions and friction points this paper is trying to address.

Optimizing merit-based selection with diversity goals
Designing choice rules balancing merit and distributional objectives
Characterizing matroids for Pareto-efficient application subsets
Innovation

Methods, ideas, or system contributions that make the work stand out.

Optimal merit-based selection with diversity constraints
Pareto frontier analysis for distributional objectives
Novel matroid characterizations in choice rules
University of Technology Sydney | the University of Tokyo | Washington University | Durham University
I
I. Hafalir
UTS Business School, University of Technology Sydney, Sydney, Australia
F
F. Kojima
Department of Economics, the University of Tokyo, Tokyo, Japan
M
M. B. Yenmez
Department of Economics, Washington University, St. Louis, MO, USA and Durham University Business School, Durham, United Kingdom
K
Koji Yokote
Graduate School of Economics, the University of Tokyo, Tokyo, Japan