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American options in a non-linear incomplete market model with default

Author

Listed:
  • Miryana Grigorova

    (School of Mathematics [Leeds] - University of Leeds)

  • Marie-Claire Quenez

    (LPSM (UMR_8001) - Laboratoire de Probabilités, Statistique et Modélisation - SU - Sorbonne Université - CNRS - Centre National de la Recherche Scientifique - UPCité - Université Paris Cité)

  • Agnès Sulem

    (MATHRISK - Mathematical Risk Handling - UPEM - Université Paris-Est Marne-la-Vallée - ENPC - École des Ponts ParisTech - Inria de Paris - Inria - Institut National de Recherche en Informatique et en Automatique)

Abstract

We study the superhedging prices and the associated superhedging strategies for American options in a non-linear incomplete market model with default. The points of view of the seller and of the buyer are presented. The underlying market model consists of a risk-free asset and a risky asset driven by a Brownian motion and a compensated default martingale. The portfolio processes follow non-linear dynamics with a non-linear driver f. We give a dual representation of the seller's (superhedging) price for the American option associated with a completely irregular payoff $(\xi_t)$ (not necessarily càdlàg) in terms of the value of a non-linear mixed control/stopping problem. The dual representation involves a suitable set of equivalent probability measures, which we call f-martingale probability measures. We also provide two infinitesimal characterizations of the seller's price process: in terms of the minimal supersolution of a constrained reflected BSDE and in terms of the minimal supersolution of an optional reflected BSDE. Under some regularity assumptions on $\xi$, we also show a duality result for the buyer's price in terms of the value of a non-linear control/stopping game problem.

Suggested Citation

  • Miryana Grigorova & Marie-Claire Quenez & Agnès Sulem, 2021. "American options in a non-linear incomplete market model with default," Post-Print hal-02025835, HAL.
    • Handle: RePEc:hal:journl:hal-02025835
    DOI: 10.1016/j.spa.2021.09.004
    Note: View the original document on HAL open archive server: https://hal.science/hal-02025835v1
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    References listed on IDEAS

    as
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