Online Combinatorial Auctions
Online Combinatorial Auctions
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在线组合拍卖
DOI:
10.1137/1.9781611976465.70
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Zhang, Hanrui
中科院分区:
文献类型:
--
作者:
Deng, Yuan;Panigrahi, Debmalya;Zhang, Hanrui
We study combinatorial auctions in online environments with the goal of maximizing social welfare. In this problem, new items become available on each day and must be sold before their respective expiration dates. We design online auctions for the widely studied classes of submodular and XOS valuations, and show the following results:– For submodular valuations, we give anO(logm)-competitive mechanism for adversarial valuations and anO(1)-competitive mechanism for Bayesian valuations, wheremis the total number of items. Both these mechanisms are computationally efficient and universally truthful for myopic agents, i.e., agents with no knowledge of the future.– For XOS valuations, we show that there is no online mechanism that can achieve a competitive ratio ofo((m/logm)1/3) even in a Bayesian setting. Our lower bound holds even if we do not require truthfulness and/or computational efficiency of the mechanism.This establishes a sharp separation between XOS valuations and its subclass of submodular valuations for online combinatorial auctions. In contrast, no such separation exists for offline auctions, where the best bounds for both submodular and XOS valuations areO((log logm)3) for adversarial settings (Assadi and Singla, FOCS 2019) andO(1) for Bayesian settings (Düttinget al., FOCS 2017).In contrast to the above, if items do not expire and only need to be sold before the market closes, then we give a reduction from offline to online mechanisms that preserves the competitive ratio for all subadditive valuations (that includes XOS and submodular valuations), thereby achieving the same bounds as the respective best offline mechanisms.
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DOI:
--
发表时间:
2020
期刊:
IEEE Annual Symposium on Foundations of Computer Science
影响因子:
--
作者:
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通讯作者:
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DOI:
--
发表时间:
2022
期刊:
Embedded Systems and Applications
影响因子:
--
作者:
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影响因子:
8.2
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DOI:
--
发表时间:
2008
期刊:
Algorithmic Game Theory
影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2012
期刊:
ACM Conference on Economics and Computation
影响因子:
--
作者:
Shahar Dobzinski;J. Vondrák
通讯作者:
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