Stability of the Weak Martingale Optimal Transport Problem

Mathias Beiglb\"ock, Benjamin Jourdain, William Margheriti and Gudmund Pammer

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Abstract: While many questions in (robust) finance can be posed in the martingale optimal transport (MOT) framework, others require to consider also non-linear cost functionals. Following the terminology of Gozlan, Roberto, Samson and Tetali this corresponds to weak martingale optimal transport (WMOT). In this article we establish stability of WMOT which is important since financial data can give only imprecise information on the underlying marginals. As application, we deduce the stability of the superreplication bound for VIX futures as well as the stability of stretched Brownian motion and we derive a monotonicity principle for WMOT.

Date: 2021-09, Revised 2022-04
New Economics Papers: this item is included in nep-isf
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