Minghao Pan et.al.

2407.14485v1

We show that in the single-parameter mechanism design environment, the only non-wasteful, symmetric, incentive compatible and sibyl-proof mechanism is a second price auction with symmetric tie-breaking. Thus, if there is private information, lotteries or other mechanisms that do not always allocate to a highest-value bidder are not sibyl-proof or not incentive compatible.

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