4.2 Article

A new impossibility result for random assignments

期刊

JOURNAL OF MATHEMATICAL ECONOMICS
卷 107, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmateco.2023.102850

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Random assignment problem; Robust ex-post pareto efficiency; Weak envy-freeness

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We show that ex-post Pareto efficiency is possible with strategy-proofness and weak envy-freeness, and that ordinal efficiency is not compatible with them. We further demonstrate this impossibility for random assignments and find that it holds even when ordinal efficiency is weakened to robust ex-post Pareto efficiency. An assignment is considered robust ex-post Pareto efficient if all deterministic assignments in its support are Pareto efficient.
We know that ex-post Pareto efficiency is possible with strategy-proofness and weak envy-freeness while ordinally efficiency is incompatible with them. We strengthen this impossibility for random assignments and show that it prevails if ordinal efficiency is weakened to robust ex-post Pareto efficiency , an intermediate notion of efficiency weaker than ordinal efficiency and stronger than ex -post Pareto efficiency. An assignment is robust ex-post Pareto efficient whenever for all of its lottery decomposition, each deterministic assignment in its support is Pareto efficient.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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