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Memory-Reduction Method for Pricing American-Style Options under Exponential Lévy Processes

Published online by Cambridge University Press:  28 May 2015

Raymond H. Chan  and
Tao Wu
Raymond H. Chan*
Affiliation:
Department of Mathematics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, PR China
Tao Wu*
Affiliation:
Department of Mathematics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, PR China
*
Corresponding author. Email: [email protected]
Corresponding author. Email: [email protected]
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Abstract

This paper concerns the Monte Carlo method in pricing American-style options under the general class of exponential Lévy models. Traditionally, one must store all the intermediate asset prices so that they can be used for the backward pricing in the least squares algorithm. Therefore the storage requirement grows like , where m is the number of time steps and n is the number of simulated paths. In this paper, we propose a simulation method where the storage requirement is only . The total computational cost is less than twice that of the traditional method. For machines with limited memory, one can now enlarge m and n to improve the accuracy in pricing the options. In numerical experiments, we illustrate the efficiency and accuracy of our method by pricing American options where the log-prices of the underlying assets follow typical Lévy processes such as Brownian motion, lognormal jump-diffusion process, and variance gamma process.

Keywords

American optionsMonte Carlo simulationmemory reductionexponential Lévy processes
Type
Research Article
Information
East Asian Journal on Applied Mathematics , Volume 1 , Issue 1 , February 2011 , pp. 20 - 34
Copyright
Copyright © Global-Science Press 2011

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