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Optimal exercise boundary for an American put option. (English) Zbl 1009.91025
Summary: The optimal exercise boundary near the expiration time is determined for an American put option. It is obtained by using Green’s theorem to convert the boundary value problem for the price of the option into an integral equation for the optimal exercise boundary. This integral equation is solved asymptotically for small values of the time to expiration. The leading term in the asymptotic solution is the result of Barles et al. An asymptotic solution for the option price is obtained also.

##### MSC:
 91B28 Finance etc. (MSC2000)
##### Keywords:
American put option; integral equation; option price
Full Text:
##### References:
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