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arXiv 1504.01780cs.GT
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有限互动下的福利最大化

Welfare Maximization with Limited Interaction

Noga Alon, Noam Nisan, Ran Raz, Omri Weinstein

摘要:

我们继续在单位需求(匹配)市场的福利最大化的研究,在一个分布式的信息模型中,代理人的估值是未知的中央计划,因此需要沟通,以确定一个有效的分配。Dobzinski,Nisan和Oren(STOC'14)表明,如果市场规模是$n$,那么$r$轮的相互作用(对数带宽)足以获得最佳社会福利的$n^{1/(r+1)}$近似。特别是,这意味着这样的市场收敛到一个稳态(常数近似)的时间对数的市场规模。我们获得了第一个多轮下界为这个设置。我们表明,即使允许每轮带宽的每个代理是$n^{ε(r)}$,任何$r$轮(随机)协议的近似比是不优于$Ω(n^{1/5^{r+1}})$,这意味着一个$Ω(\log \log n)$的市场收敛到均衡的速度的下限。我们的建设和技术可能会感兴趣的组合拍卖,其中唯一已知的下限是同步($r=1$)协议[DNO 14]的更一般的设置中的轮通信权衡。

英文摘要:

We continue the study of welfare maximization in unit-demand (matching) markets, in a distributed information model where agent's valuations are unknown to the central planner, and therefore communication is required to determine an efficient allocation. Dobzinski, Nisan and Oren (STOC'14) showed that if the market size is $n$, then $r$ rounds of interaction (with logarithmic bandwidth) suffice to obtain an $n^{1/(r+1)}$-approximation to the optimal social welfare. In particular, this implies that such markets converge to a stable state (constant approximation) in time logarithmic in the market size. We obtain the first multi-round lower bound for this setup. We show that even if the allowable per-round bandwidth of each agent is $n^{ε(r)}$, the approximation ratio of any $r$-round (randomized) protocol is no better than $Ω(n^{1/5^{r+1}})$, implying an $Ω(\log \log n)$ lower bound on the rate of convergence of the market to equilibrium. Our construction and technique may be of interest to round-communication tradeoffs in the more general setting of combinatorial auctions, for which the only known lower bound is for simultaneous ($r=1$) protocols [DNO14].

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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