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arXiv · 2601.16412

Tight Regret Bounds for Bilateral Trade under Semi Feedback

Yaonan Jin
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Abstract

The study of \textit{regret minimization in fixed-price bilateral trade} has received considerable attention in recent research. Previous works [CCC+24a, CCC+24b, AFF24, BCCF24, CJLZ25, LCM25a, GDFS25] have acquired a thorough understanding of the problem, except for determining the tight regret bound for GBB semi-feedback fixed-price mechanisms under adversarial values. In this paper, we resolve this open question by devising an $\widetilde{O}(T^{2 / 3})$-regret mechanism, matching the $\Omega(T^{2 / 3})$ lower bound from [CJLZ25] up to polylogarithmic factors.

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Yaonan Jin. 2026-01-23. Tight Regret Bounds for Bilateral Trade under Semi Feedback. https://arxiv.org/abs/2601.16412

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