Option pricing with random volatilities in complete markets |
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Authors: | Larry Eisenberg Robert Jarrow |
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Institution: | (1) Lehman Brothers, 3 World Financial Center, 10285-0700 New York, NY;(2) Johnson Graduate School of Management, Cornell University, Malott Hall, 14853 Ithaca, NY |
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Abstract: | This article presents the theory of option pricing with random volatilities in complete markets. As such, it makes two contributions. First, the newly developed martingale measure technique is used to synthesize results dating from Merton (1973) through Eisenberg, (1985, 1987). This synthesis illustrates how Merton's formula, the CEV formula, and the Black-Scholes formula are special cases of the random volatility model derived herein. The impossibility of obtaining a self-financing trading strategy to duplicate an option in incomplete markets is demonstrated. This omission is important because option pricing models are often used for risk management, which requires the construction of synthetic options.Second, we derive a new formula, which is easy to interpret and easy to program, for pricing options given a random volatility. This formula (for a European call option) is seen to be a weighted average of Black-Scholes values, and is consistent with recent empirical studies finding evidence of mean-reversion in volatilities.Helpful comments from an anonymous referee are greatly appreciated. |
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Keywords: | option pricing synthetic options martingale measure European call option |
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