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- W193557870 abstract "In a cost-sharing problem, finitely many players have an unknown preference for some non-rivalrous but excludable good (service). The task is to determine which set of players Q to serve and how to distribute the incurred cost C(Q). Typical constraints of cost-sharing problems demand for mechanisms that elicit truthful bids, balance the budget (i.e., recover the incurred cost with the prices charged), and are economically ecient (i.e., trade o the service cost and the excluded players' valuations as good as possible). The only known general technique for the design of cost-sharing mechanisms that are truthful in the strong sense, i.e., resilient also against manipulation by coalitions (group-strategyproof, GSP), is due to Moulin (1999). Unfortunately, there are several natural cost-sharing problems for which any Moulin mechanism inevitably suers poor budget-balance and economic eciency. In this work, we make first important steps towards new general design techniques for GSP mechanisms: We devise a novel family of polynomial-time computable mechanisms that, for the class of subadditive symmetric cost functions, achieve provably better budget balance than any Moulin mechanism. We apply our findings to the problem of sharing the makespan cost when scheduling jobs on parallel related machines. Towards understanding the limitations imposed by GSP itself, we establish an impossibility result stating that for more than three players, exactly budget-balanced GSP mechanisms do not exist in general, even if the cost function is symmetric." @default.
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- W193557870 date "2009-01-01" @default.
- W193557870 modified "2023-10-01" @default.
- W193557870 title "The Power of Lexicographic Maximization: Beyond Cross-Monotonicity" @default.
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