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Sample Complexity for Non-Truthful Mechanisms

This paper considers the design of non-truthful mechanisms from samples. We identify a parameterized family of mechanisms with strategically simple winner-pays-bid, all-pay, and truthful payment formats. In general (not necessarily downward-closed) single-parameter feasibility environments we prove that the family has low representation and generalization error. Specifically, polynomially many bid samples suffice to identify and run a mechanism that is ε-close in Bayes-Nash equilibrium revenue or welfare to that of the optimal truthful mechanism.