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Exercise Boundary of the American Put Near Maturity in an Exponential Lévy Model

Damien Lamberton 1, 2 Mohammed Mikou 2 
1 MATHRISK - Mathematical Risk handling
Inria Paris-Rocquencourt, UPEM - Université Paris-Est Marne-la-Vallée, ENPC - École des Ponts ParisTech
Abstract : We study the behavior of the critical price of an American put option near maturity in the exponential Lévy model. In particular, we prove that, in situations where the limit of the critical price is equal to the strike price, the rate of convergence to the limit is linear if and only if the underlying Lévy process has finite variation. In the case of infinite variation, a variety of rates of convergence can be observed: we prove that, when the negative part of the Lévy measure exhibits an $\alpha$-stable density near the origin, with $1<\alpha<2$, the convergence rate is ruled by $\theta^{1/\alpha}|\ln \theta|^{1-\frac{1}{\alpha}}$, where $\theta$ is time until maturity.
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Damien Lamberton, Mohammed Mikou. Exercise Boundary of the American Put Near Maturity in an Exponential Lévy Model. Finance and Stochastics, Springer Verlag (Germany), 2012, 17 (2), pp.355-394. ⟨10.1007/s00780-012-0194-z⟩. ⟨hal-00796717⟩



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