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Robust No-Arbitrage under Projective Determinacy

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  • Alexandre Boistard
  • Laurence Carassus
  • Safae Issaoui

Abstract

Drawing from set theory, this article contributes to a deeper understanding of the no-arbitrage principle in multiple-priors settings and its application in mathematical finance. In the quasi-sure discrete-time frictionless market framework of Bouchard and Nutz, the equivalence between the quasi-sure no-arbitrage condition and the existence of a probability measure for which the local one-prior no-arbitrage condition holds and the affine hull of the support is equal to the quasi-sure support, all of this in a quasi-sure sense, was established by Blanchard and Carassus. We aim to extend this result to the projective setup introduced by Carassus and Ferhoune. This setup allows for standardised measurability assumptions, in contrast to the framework of Bouchard and Nutz, where prices are assumed to be Borel measurable, strategies and stochastic kernels universally measurable, and the graphs of one-step priors analytic sets. To achieve this, we assume the classical axioms of Zermelo-Fraenkel set theory, including the axiom of choice (ZFC), supplemented by the Projective Determinacy (PD) axiom. In ZFC+PD the existence of such probability measures was assumed by Carassus and Ferhoune to prove the existence of solutions in a quasi-sure nonconcave utility maximisation problem. The equivalence with the quasi-sure no-arbitrage was only conjectured.

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  • Alexandre Boistard & Laurence Carassus & Safae Issaoui, 2025. "Robust No-Arbitrage under Projective Determinacy," Papers 2504.00158, arXiv.org.
    • Handle: RePEc:arx:papers:2504.00158
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    References listed on IDEAS

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