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arXiv 2103.06177cs.GT
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带广告类型拍卖的均衡

Equilibria in Auctions With Ad Types

Hadi Elzayn, Riccardo Colini-Baldeschi, Brian Lan, Okke Schrijvers

摘要:

本文研究了半可分位置拍卖(称为广告类型设置)的均衡质量与贪婪或最优分配结合广义第二价格(GSP)或Vickrey-Clarke-Groves(VCG)定价。我们做出三个贡献:首先给出了在贪婪分配和GSP定价、贪婪分配和VCG定价以及最优分配和GSP定价下的无政府状态下的无政府代价(PoA)的上界和下界。其次,我们给出了贝叶斯-纳什均衡特征的两个球员,两个插槽的情况下(所有的拍卖格式),并表明,存在一个收入层次结构和收入等价在某些格式。最后,我们使用无遗憾学习算法和来自大型在线广告平台的竞价数据和无遗憾学习算法来评估半现实条件下的机制的性能。对于福利,我们发现,最佳实现的福利比(经验PoA模拟)是广泛优于我们的上限PoA;收入,我们发现,在实践中的层次结构有时可能同意简单的理论,但一般出现敏感的潜在分布的投标人估值。

英文摘要:

This paper studies equilibrium quality of semi-separable position auctions (known as the Ad Types setting) with greedy or optimal allocation combined with generalized second-price (GSP) or Vickrey-Clarke-Groves (VCG) pricing. We make three contributions: first, we give upper and lower bounds on the Price of Anarchy (PoA) for auctions which use greedy allocation with GSP pricing, greedy allocations with VCG pricing, and optimal allocation with GSP pricing. Second, we give Bayes-Nash equilibrium characterizations for two-player, two-slot instances (for all auction formats) and show that there exists both a revenue hierarchy and revenue equivalence across some formats. Finally, we use no-regret learning algorithms and bidding data from a large online advertising platform and no-regret learning algorithms to evaluate the performance of the mechanisms under semi-realistic conditions. For welfare, we find that the optimal-to-realized welfare ratio (an empirical PoA analogue) is broadly better than our upper bounds on PoA; For revenue, we find that the hierarchy in practice may sometimes agree with simple theory, but generally appears sensitive to the underlying distribution of bidder valuations.

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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