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Two-Sided Random Matching Markets: Ex-Ante Equivalence of the Deferred Acceptance Procedures

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  • Simon Mauras

Abstract

Stable matching in a community consisting of $N$ men and $N$ women is a classical combinatorial problem that has been the subject of intense theoretical and empirical study since its introduction in 1962 in a seminal paper by Gale and Shapley. When the input preference profile is generated from a distribution, we study the output distribution of two stable matching procedures: women-proposing-deferred-acceptance and men-proposing-deferred-acceptance. We show that the two procedures are ex-ante equivalent: that is, under certain conditions on the input distribution, their output distributions are identical. In terms of technical contributions, we generalize (to the non-uniform case) an integral formula, due to Knuth and Pittel, which gives the probability that a fixed matching is stable. Using an inclusion-exclusion principle on the set of rotations, we give a new formula which gives the probability that a fixed matching is the women/men-optimal stable matching. We show that those two probabilities are equal with an integration by substitution.

Suggested Citation

  • Simon Mauras, 2020. "Two-Sided Random Matching Markets: Ex-Ante Equivalence of the Deferred Acceptance Procedures," Papers 2005.08584, arXiv.org.
    • Handle: RePEc:arx:papers:2005.08584
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    References listed on IDEAS

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    Cited by:

    1. Maxwell Allman & Itai Ashlagi, 2023. "Interviewing Matching in Random Markets," Papers 2305.11350, arXiv.org, revised Sep 2023.

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