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Best-of-Both-Worlds Fairness of the Envy-Cycle-Elimination Algorithm

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arxiv 2410.08986 v2 pith:WFC3LGJW submitted 2024-10-11 cs.GT

classification cs.GT
keywords agentsalgorithmex-anteallocationenvy-cycle-eliminationproportionalityrandomizedachieve
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abstract

We consider the problem of fairly dividing indivisible goods among agents with additive valuations. It is known that an Epistemic EFX and $2/3$-MMS allocation can be obtained using the Envy-Cycle-Elimination (ECE) algorithm. In this work, we explore whether this algorithm can be randomized to also ensure ex-ante proportionality. For two agents, we show that a randomized variant of ECE can compute an ex-post EFX and ex-ante envy-free allocation in near-linear time. However, for three agents, we show that several natural randomization methods for ECE fail to achieve ex-ante proportionality.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Probing EFX via PMMS: (Non-)Existence Results in Discrete Fair Division

    cs.GT 2025-07 reject novelty 7.0 of 10

    The paper proves a three-agent EFX/PMMS separation and claims PMMS existence for binary-valued and pair-demand valuations, plus EFX for personalized bivalued valuations.

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