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Implementing the Optimal Auction

In a general framework with independent private values of the bidders, we propose a game, with a simple economic interpretation, that allows implementing the optimal auction outcome when the seller ignores the distributions of the different bidders' valuations. In this robust or detail-free implementation procedure, a second-price auction is organized and the winner volunteers a payment to the seller; this payment can then be challenged by another bidder who knows the distribution of the winner's valuation.
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