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Default swap games driven by spectrally negative Lévy processes. (English) Zbl 1255.91418

Summary: We study game-type credit default swaps that allow the protection buyer and seller to raise or reduce their respective positions once prior to default. This leads to the study of an optimal stopping game subject to early default termination. Under a structural credit risk model based on spectrally negative Lévy processes, we apply the principles of smooth and continuous fit to identify the equilibrium exercise strategies for the buyer and the seller. We then rigorously prove the existence of the Nash equilibrium and compute the contract value at equilibrium. Numerical examples are provided to illustrate the impacts of default risk and other contractual features on the players’ exercise timing at equilibrium.

MSC:

91G40 Credit risk
91G20 Derivative securities (option pricing, hedging, etc.)
91A15 Stochastic games, stochastic differential games
60G40 Stopping times; optimal stopping problems; gambling theory
60G51 Processes with independent increments; Lévy processes
91B25 Asset pricing models (MSC2010)
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