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Pricing by American Option by Approximating its Early Exercise Boundary as a Multipiece Exponential Function

Nengjiu Ju

University of Maryland, College Park

Review of Financial Studies 1998

This article proposes to price an American option by approximating its early exercise boundary as a multipiece exponential function. Closed form formulas are obtained in terms of the bases and exponents of the multipiece exponential function. It is demonstrated that a three-point extrapolation scheme has the accuracy of an 800-time-step binomial tree, but is about 130 times faster. An intuitive argument is given to indicate why this seemingly crude approximation works so well. Our method is very simple and easy to implement. Comparisons with other leading competing methods are also included.

DOI
10.1093/rfs/11.3.627
Volume
11 (3)
Pages
627-646
Language
en
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