Comment on `What's the Matter with Tie-Breaking: Improving Efficiency in School Choice'

Tom Demeulemeester

Papers from arXiv.org

Abstract: The code that was used in Erdil & Ergin (2008, AER) to compute stable improvement cycles sometimes generated unstable matchings. I identify the minor bug in their code that caused this issue, and I present a corrected implementation. While the general insights from the computational experiments obtained by Erdil & Ergin (2008) persist, the true fraction of improving students is slightly smaller than reported, while their average improvement in rank is larger than reported. All theoretical findings in Erdil & Ergin (2008) are unaffected.

Date: 2026-02
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