Quantitative Fundamental Theorem of Asset Pricing

Beatrice Acciaio, Julio Backhoff‐Veraguas and Gudmund Pammer

Mathematical Finance, 2025, vol. 35, issue 3, 636-660

Abstract: In this paper, we provide a quantitative analysis of the concept of arbitrage, that allows us to deal with model uncertainty without imposing the no‐arbitrage condition. In markets that admit “small arbitrage,” we can still make sense of the problems of pricing and hedging. The pricing measures here will be such that asset price processes are close to being martingales, and the hedging strategies will need to cover some additional costs. We show a quantitative version of the fundamental theorem of asset pricing (FTAP) and of the super‐replication theorem. Finally, we study robustness of the amount of arbitrage and existence of respective pricing measures, showing stability of these concepts with respect to a strongly adapted Wasserstein distance.

Date: 2025
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