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Object Allocation via Deferred-Acceptance: Strategy-Proofness and Comparative Statics

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  • Lars Ehlers
  • Bettina Klaus
Abstract
We study the problem of assigning indivisible and heterogenous objects (e.g., houses, jobs, offices, school or university admissions etc.) to agents. Each agent receives at most one object and monetary compensations are not possible. We consider mechanisms satisfying a set of basic properties (unavailable-type-invariance, individual-rationality, weak non-wastefulness, or truncation-invariance). In the house allocation problem, where at most one copy of each object is available, deferred acceptance (DA)-mechanisms allocate objects based on exogenously fixed objects' priorities over agents and the agent-proposing deferred-acceptance-algorithm. For house allocation we show that DA-mechanisms are characterized by our basic properties and (i) strategy-proofness and population-monotonicity or (ii) strategy-proofness and resource-monotonicity. Once we allow for multiple identical copies of objects, on the one hand the first characterization breaks down and there are unstable mechanisms satisfying our basic properties and (i) strategy-proofness and population-monotonicity. On the other hand, our basic properties and (ii) strategy-proofness and resource-monotonicitycharacterize (the most general) class of DA-mechanisms based on objects' fixed choice functions that are acceptant, monotonic, substitutable, and consistent. These choice functions are used by objects to reject agents in the agent-proposing deferred-acceptance-algorithm. Therefore, in the general model resource-monotonicity is the "stronger" comparative statics requirement because it characterizes (together with our basic requirements and strategy-proofness) choice-based DA-mechanisms whereas population-monotonicity (together with our basic properties and strategy-proofness) does not.

Suggested Citation

  • Lars Ehlers & Bettina Klaus, 2014. "Object Allocation via Deferred-Acceptance: Strategy-Proofness and Comparative Statics," Cahiers de Recherches Economiques du Département d'économie 14.08, Université de Lausanne, Faculté des HEC, Département d’économie.
    • Handle: RePEc:lau:crdeep:14.08
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    Cited by:

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    2. Bettina Klaus & Alexandru Nichifor, 2020. "Serial dictatorship mechanisms with reservation prices," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 70(3), pages 665-684, October.
    3. Mustafa Oğuz Afacan & Umut Mert Dur, 2020. "Constrained stability in two-sided matching markets," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 55(3), pages 477-494, October.
    4. BONKOUNGOU, Somouaoga, 2016. "Pareto dominance of deferred acceptance through early decision," Cahiers de recherche 2016-07, Universite de Montreal, Departement de sciences economiques.
    5. Bettina Klaus & Alexandru Nichifor, 2021. "Serial dictatorship mechanisms with reservation prices: heterogeneous objects," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 57(1), pages 145-162, July.
    6. Ayoade, Nickesha & Pápai, Szilvia, 2023. "School choice with preference rank classes," Games and Economic Behavior, Elsevier, vol. 137(C), pages 317-341.
    7. Karakaya, Mehmet & Klaus, Bettina & Schlegel, Jan Christoph, 2019. "Top trading cycles, consistency, and acyclic priorities for house allocation with existing tenants," Journal of Economic Theory, Elsevier, vol. 184(C).
    8. Bilancini, Ennio & Boncinelli, Leonardo & Newton, Jonathan, 2020. "Evolution and Rawlsian social choice in matching," Games and Economic Behavior, Elsevier, vol. 123(C), pages 68-80.
    9. Battal Dou{g}an & Kenzo Imamura & M. Bumin Yenmez, 2022. "Market Design with Deferred Acceptance: A Recipe for Policymaking," Papers 2209.06777, arXiv.org.
    10. Battal Doğan & Serhat Doğan & Kemal Yıldız, 2021. "Lexicographic choice under variable capacity constraints," Journal of Public Economic Theory, Association for Public Economic Theory, vol. 23(1), pages 172-196, February.
    11. Julien Combe & Jan Christoph Schlegel, 2021. "Reallocation with Priorities," Working Papers 2021-09, Center for Research in Economics and Statistics.
    12. Doğan, Battal & Klaus, Bettina, 2018. "Object allocation via immediate-acceptance: Characterizations and an affirmative action application," Journal of Mathematical Economics, Elsevier, vol. 79(C), pages 140-156.
    13. Combe, Julien & Schlegel, Jan Christoph, 2024. "Reallocation with priorities," Games and Economic Behavior, Elsevier, vol. 143(C), pages 287-299.
    14. Somouaoga Bonkoungou, 2021. "Decentralized college admissions under single application," Review of Economic Design, Springer;Society for Economic Design, vol. 25(1), pages 65-91, June.
    15. Keisuke Bando & Kenzo Imamura, 2016. "A necessary and sufficient condition for weak Maskin monotonicity in an allocation problem with indivisible goods," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 47(3), pages 589-606, October.
    16. Afacan, Mustafa Oǧuz, 2017. "Some further properties of the cumulative offer process," Games and Economic Behavior, Elsevier, vol. 104(C), pages 656-665.
    17. Kasajima, Yoichi & Toda, Manabu, 2024. "Singles monotonicity and stability in one-to-one matching problems," Games and Economic Behavior, Elsevier, vol. 143(C), pages 269-286.
    18. Mustafa Oğuz Afacan & Umut Dur, 2023. "Strategy‐proof size improvement: is it possible?," Scandinavian Journal of Economics, Wiley Blackwell, vol. 125(2), pages 321-338, April.
    19. Somouaoga BONKOUNGOU, 2016. "Pareto Dominance of Deferred Acceptance through Early Decision," Cahiers de recherche 11-2016, Centre interuniversitaire de recherche en économie quantitative, CIREQ.
    20. Zhang, Jun, 2023. "Strategy-proof allocation with outside option," Games and Economic Behavior, Elsevier, vol. 137(C), pages 50-67.

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    More about this item

    Keywords

    indivisible objects allocation; deferred-acceptance-algorithm; strategy-proofness; resource-monotonicity; population-monotonicity;
    All these keywords.

    JEL classification:

    • D63 - Microeconomics - - Welfare Economics - - - Equity, Justice, Inequality, and Other Normative Criteria and Measurement
    • D70 - Microeconomics - - Analysis of Collective Decision-Making - - - General

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