5 papers
A Simple Method for School Choice Lotteries
Yasunori Okumura
This note proposes a simple polynomial-time method for constructing an ex ante stable school-choice lottery satisfying equal treatment of equals (ETE). We show that the ETE reassig…
Testing a Graph-Theoretic Condition for Aggregating Incomplete Rankings: A Technical Note
Yasunori Okumura
This note shows how Condition 1 in Okumura (2025) can be tested efficiently using a standard graph-theoretic algorithm. It also describes an efficient implementation of Okumura's m…
Equal Treatment of Equals and Efficiency in Probabilistic Assignments
Yasunori Okumura
This paper studies general multi-unit probabilistic assignment problems involving indivisible objects, with a particular focus on achieving the fairness notion of equal treatment o…
Strategic Analysis of Fair Rank-Minimizing Mechanisms with Agent Refusal Option
Yasunori Okumura
This paper investigates the strategic implications of the uniform rank-minimizing mechanism (URM), an assignment rule that selects uniformly from the set of deterministic assignmen…
Aggregating Incomplete Rankings
Yasunori Okumura
This study considers the method to derive a ranking of alternatives by aggregating the rankings submitted by several individuals who may not evaluate all of them. The collection of…