Abstract
In mechanism design, fairness is one of the central criteria for analyzing mechanisms. Recently, a new fairness concept called envy-freeness of a group toward a group (GtG-EFness) has received attention, which requires that no group of agents envies any other group. In this paper, we consider GtG-EFness in more general combinatorial auctions, including several subclasses of the multi-unit auction domain (unit-demand, diminishing marginal values, and all-or-nothing), and reveal the tight bound of the competitive ratios. In particular, we prove that the tight bound of the competitive ratio is 1/k (where k is the number of items) for the general combinatorial auction domain. We also clarify the relationship with Walrasian equilibria and conclude that no group envies any other group in any Walrasian equilibrium.
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Notes
- 1.
We abbreviate the GCA domain as GCA interchangeably, and the others as well.
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Acknowledgments
This work is partially supported by JSPS KAKENHI Grants JP17H00761 and JP17H04695. The authors thank Takayuki Mouri for his helpful comments and discussions. All errors are our own.
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Todo, T., Iwasaki, A., Yokoo, M. (2019). Competitive Auctions and Envy-Freeness for Group of Agents. In: Du, DZ., Duan, Z., Tian, C. (eds) Computing and Combinatorics. COCOON 2019. Lecture Notes in Computer Science(), vol 11653. Springer, Cham. https://doi.org/10.1007/978-3-030-26176-4_45
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DOI: https://doi.org/10.1007/978-3-030-26176-4_45
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