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GSP auctions

A generalized second-price auction is a multi-item sealed-bid auction mechanism commonly used in online advertising, where multiple ad placements are allocated to bidders based on their submitted bids. In this auction format, the highest bidder receives the most prominent placement and pays the amount submitted by the second-highest bidder, the second-highest bidder receives the next placement and pays the amount submitted by the third-highest bidder, and this rule continues sequentially down through all available slots. While it extends the pricing principle of the single-item standard second-price auction to multiple ranked items, it differs from truthful mechanisms because bidding true valuation is generally not a dominant strategy. Despite this theoretical departure from strict incentive compatibility, generalized second-price auctions remain a dominant standard in digital ad exchanges and search engine marketing due to their computational simplicity, intuitive pricing structure, and tendency to achieve stable market equilibria.

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