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About this paper

Yoav Kolumbus, Noam Nisan

Researchers at The Hebrew University of Jerusalem investigated how regret-minimizing software agents influence repeated first-price, second-price, and generalized first-price auctions. They found that second-price auctions lose their incentive compatibility, prompting users to misreport valuations, while generalized first-price auctions exhibited severe implicit collusion among agents, allowing users to capture approximately 89% of the total welfare.

Key insights

  • Auction mechanisms designed for human bidders may lose their incentive-compatible properties when regret-minimizing agents are introduced, fundamentally altering strategic user incentives.
  • The concept of 'co-undominated CCE' offers a more predictive analytical tool for the long-term behavior of mean-based regret-minimizing algorithms than general CCE analysis.
  • In second-price auctions, users have an incentive to misreport (exaggerate) their valuations to their agents, leading to lower average prices paid and significantly reduced auctioneer revenue.

Summary by alphaXiv.

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