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arXiv 1612.04746cs.GT
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一种简单的近似最优的带补买方机制

A Simple and Approximately Optimal Mechanism for a Buyer with Complements

Alon Eden, Michal Feldman, Ophir Friedler, Inbal Talgam-Cohen, S. Matthew Weinberg

摘要:

我们考虑一个收入最大化的卖方与$m$异质项目和一个单一的买方,其估价$v$的项目可能会表现出两个替代品(即,对于一些$S, T$,$v(S \cup T) < v(S) + v(T)$)和互补物(即,对于一些$S, T$、$v(S \cup T) > v(S) + v(T)$)。我们证明了Babaioff等人首次提出的机制。[2014] -更好地分别销售物品并将其捆绑在一起-保证了最佳收入的$Θ(d)$部分,其中$d$是互补程度的度量。请注意,这是第一个近似最优的机制,其估值表现出任何形式的互补性,并扩展了Rubinstein和Weinberg [2015]的工作,该工作证明了当买方估值是次加性时,相同的简单机制实现了常数因子近似,这是最普遍的无互补估值。我们的证明是由Cai et al. [2016]最近开发的对偶框架实现的,我们使用该框架来获得这种设置下的最优收入的界限。我们的主要技术贡献是专门处理复杂的设置与补充,并包括一个超图分割边缘的算法。甚至确定正确的模型和“互补度”的概念以获得有意义的结果也是有趣的,因为先前定义的自然扩展可证明是失败的。

英文摘要:

We consider a revenue-maximizing seller with $m$ heterogeneous items and a single buyer whose valuation $v$ for the items may exhibit both substitutes (i.e., for some $S, T$, $v(S \cup T) < v(S) + v(T)$) and complements (i.e., for some $S, T$, $v(S \cup T) > v(S) + v(T)$). We show that the mechanism first proposed by Babaioff et al. [2014] - the better of selling the items separately and bundling them together - guarantees a $Θ(d)$ fraction of the optimal revenue, where $d$ is a measure on the degree of complementarity. Note that this is the first approximately optimal mechanism for a buyer whose valuation exhibits any kind of complementarity, and extends the work of Rubinstein and Weinberg [2015], which proved that the same simple mechanisms achieve a constant factor approximation when buyer valuations are subadditive, the most general class of complement-free valuations. Our proof is enabled by the recent duality framework developed in Cai et al. [2016], which we use to obtain a bound on the optimal revenue in this setting. Our main technical contributions are specialized to handle the intricacies of settings with complements, and include an algorithm for partitioning edges in a hypergraph. Even nailing down the right model and notion of "degree of complementarity" to obtain meaningful results is of interest, as the natural extensions of previous definitions provably fail.

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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