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arXiv · 2501.15295

Constant Inapproximability of Pacing Equilibria in Second-Price Auctions

Xi Chen·Yuhao Li
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Abstract

In this paper, we revisit the problem of approximating a pacing equilibrium in second-price auctions, introduced by Conitzer, Kroer, Sodomka, and Moses [Oper. Res. 2022]. We show that finding a constant-factor approximation of a pacing equilibrium is PPAD-hard, thereby strengthening previous results of Chen, Kroer, and Kumar [Math. Oper. Res. 2024], which established PPAD-hardness only for inverse-polynomial approximations.

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Xi Chen, Yuhao Li. 2025-01-25. Constant Inapproximability of Pacing Equilibria in Second-Price Auctions. https://arxiv.org/abs/2501.15295

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