An Asymptotic Analysis of an American Call Option with Small Volatility

N.P. Firth, J.N. Dewynne and S. J. Chapman

OFRC Working Papers Series from Oxford Financial Research Centre

Abstract: In this paper we present an asymptotic analysis of an American call option where the diffusion term (volatility) is small compared to the drift terms (interest rate and continuous dividend yield). We show that in the limit where diffusion is negligible, relative to drift, then, at leading order, the American call’s behaviour is the same as a perpetual American call option (except in a boundary layer about the option’s expiry date).

Date: 2004
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