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A fast high-order finite difference algorithm for pricing American options

✍ Scribed by D.Y. Tangman; A. Gopaul; M. Bhuruth

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 415 KB
Volume: 222
Category: Article
ISSN: 0377-0427
DOI: 10.1016/j.cam.2007.10.044

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✦ Synopsis

We describe an improvement of Han and Wu's algorithm [H. Han, X.Wu, A fast numerical method for the Black-Scholes equation of American options, SIAM J. Numer. Anal. 41 (6) (2003Anal. 41 (6) ( ) 2081Anal. 41 (6) ( -2095] ] for American options. A high-order optimal compact scheme is used to discretise the transformed Black-Scholes PDE under a singularity separating framework. A more accurate free boundary location based on the smooth pasting condition and the use of a non-uniform grid with a modified tridiagonal solver lead to an efficient implementation of the free boundary value problem. Extensive numerical experiments show that the new finite difference algorithm converges rapidly and numerical solutions with good accuracy are obtained. Comparisons with some recently proposed methods for the American options problem are carried out to show the advantage of our numerical method.

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