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arXiv · 2507.09152

Egalitarian-equivalent and strategy-proof mechanisms in homogeneous multi-object allocation problems

Hinata Kurashita·Ryosuke Sakai
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Abstract

We study the problem of allocating homogeneous indivisible objects among agents with money. In particular, we investigate the relationship between egalitarian-equivalence (Pazner and Schmeidler, 1978), as a fairness concept, and efficiency under agents' incentive constraints. As a first result, we characterize the class of mechanisms that satisfy egalitarian-equivalence, strategy-proofness, individual rationality, and no subsidy. Our characterization reveals a strong tension between egalitarian-equivalence and efficiency: under these properties, objects are allocated only in limited cases. To address this limitation, we replace strategy-proofness with the weaker incentive property non-obvious manipulability (Troyan and Morrill, 2020). We show that this relaxation allows us to design mechanisms that achieve efficiency while still ensuring egalitarian-equivalence. Furthermore, under efficiency, we identify the agent-welfare-optimal mechanism in the characterized class.

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Hinata Kurashita, Ryosuke Sakai. 2025-07-12. Egalitarian-equivalent and strategy-proof mechanisms in homogeneous multi-object allocation problems. https://arxiv.org/abs/2507.09152

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