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Pricing American call options under a hard-to-borrow stock model

Published online by Cambridge University Press:  22 September 2017

GUIYUAN MA  and
SONG-PING ZHU
GUIYUAN MA
Affiliation:
School of Mathematics and Applied Statistics, University of Wollongong NSW 2522, Australia emails: gm387@uowmail.edu.au, spz@uow.edu.au
SONG-PING ZHU
Affiliation:
School of Mathematics and Applied Statistics, University of Wollongong NSW 2522, Australia emails: gm387@uowmail.edu.au, spz@uow.edu.au
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Abstract

While a classic result by Merton (1973, Bell J. Econ. Manage. Sci., 141–183) is that one should never exercise an American call option just before expiration if the underlying stock pays no dividends, the conclusion of a very recent empirical study conducted by Jensen and Pedersen (2016, J. Financ. Econ.121(2), 278–299) suggests that one should ‘never say never’. This paper complements Jensen and Pedersen's empirical study by presenting a theoretical study on how to price American call options under a hard-to-borrow stock model proposed by Avellaneda and Lipkin (2009, Risk22(6), 92–97). Our study confirms that it is the lending fee that results in the early exercise of American call options and we shall also demonstrate to what extent lending fees have affected the early exercise decision.

Keywords

Hard-to-borrow stockEarly exerciseLending feesOption pricing
Type
Papers
Information
European Journal of Applied Mathematics , Volume 29 , Issue 3 , June 2018 , pp. 494 - 514
Copyright
Copyright © Cambridge University Press 2017 

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