arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.7595cs.GT
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真实的多单位预算

Truthful Multi-unit Procurements with Budgets

Hau Chan, Jing Chen

摘要:

我们研究的采购博弈中,每个卖家提供多个单位的物品,每单位的成本只有他自己知道。买家可以从每个卖家那里购买任意数量的单位,对不同的物品组合有不同的价值,并对他的总付款有一个预算。对于一类特殊的采购游戏,{ \em有界背包}问题,我们表明,没有普遍真实的可行的机制可以近似的最优值的买方在$\ln n$,其中$n$是所有项目的单位总数。然后,我们构建了一个多项式时间机制,给出了一个$4(1+\ln n)$ -近似采购游戏{ \em凹添加剂估值},其中包括有界背包作为一个特殊情况。因此,我们的机制在恒定因子下是最佳的。此外,对于有界背包问题,给定著名的FPTAS,我们的结果意味着有一个可证明的差距之间的优化域和机制设计域。最后,采购游戏{ \em次加性估值},我们构建了一个普遍真实的可行的机制,给出了一个$O(\frac{\log^2 n}{\log \log n})$ -近似在多项式时间的需求预言。

英文摘要:

We study procurement games where each seller supplies multiple units of his item, with a cost per unit known only to him. The buyer can purchase any number of units from each seller, values different combinations of the items differently, and has a budget for his total payment. For a special class of procurement games, the {\em bounded knapsack} problem, we show that no universally truthful budget-feasible mechanism can approximate the optimal value of the buyer within $\ln n$, where $n$ is the total number of units of all items available. We then construct a polynomial-time mechanism that gives a $4(1+\ln n)$-approximation for procurement games with {\em concave additive valuations}, which include bounded knapsack as a special case. Our mechanism is thus optimal up to a constant factor. Moreover, for the bounded knapsack problem, given the well-known FPTAS, our results imply there is a provable gap between the optimization domain and the mechanism design domain. Finally, for procurement games with {\em sub-additive valuations}, we construct a universally truthful budget-feasible mechanism that gives an $O(\frac{\log^2 n}{\log \log n})$-approximation in polynomial time with a demand oracle.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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