Abstract
Fair division captures many real-world scenarios and plays an important role in many research fields including computer science, economy, operations research, etc. For the problem of indivisible goods allocation, it is well-known that an allocation satisfying the maximum Nash Social Welfare (Max-NSW) is envy-free up to one good (EF1), which is an important fairness concept. However, EF1 is often considered to be somewhat weak since one may remove the most valuable good. In this paper, we investigate the relationship between the Max-NSW allocation and a stronger fairness concept, envy-free up to any good (EFX), which means the envyness disappears after the removal of the least valuable good. We focus on the budget-feasible variant in which each agent has a budget to cover the total cost of goods she gets. We show that a Max-NSW allocation guarantees \(\frac{1}{4}\)-EFX when agents’ value are in the Binary \(\{0,1\}\) . Moreover, we provide an algorithm to find a budget-feasible EFX allocation for the Binary variant.
Supported by the National Key Research and Development Project of China (Grant No. 2019YFB2102500), NSFC (Grant No. 12071460, 62102117), the Fundamental Research Project of Shenzhen City (No. JCYJ20210324102012033) and the Shenzhen Science and Technology Program (Grant No. RCBS20210609103900003).
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Dai, S. et al. (2022). EFX Under Budget Constraint. In: Li, M., Sun, X. (eds) Frontiers of Algorithmic Wisdom. IJTCS-FAW 2022. Lecture Notes in Computer Science, vol 13461. Springer, Cham. https://doi.org/10.1007/978-3-031-20796-9_1
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