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A non-Gaussian option pricing model with skew 

Authors: Lisa Borland a; Jean-Philippe Bouchaud b
Affiliations:   a Evnine-Vaughan Associates, Inc., San Francisco, CA, USA
b Science and Finance/Capital Fund Management, Paris, France
DOI: 10.1080/14697680400000034
Publication Frequency: 8 issues per year
Published in: journal Quantitative Finance, Volume 4, Issue 5 October 2004 , pages 499 - 514
Number of References: 38
Formats available: PDF (English)
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Abstract

Closed-form option pricing formulae explaining skew and smile are obtained within a parsimonious non-Gaussian framework. We extend the non-Gaussian option pricing model of Borland (2002 Quant. Finance 2415-31) to include volatility-stock correlations consistent with the leverage effect. A generalized Black-Scholes partial differential equation for this model is obtained, together with closed-form approximate solutions for the fair price of a European call option. In certain limits, the standard Black-Scholes model is recovered, as is the Constant Elasticity of Variance (CEV) model of Cox and Ross. Alternative solution methods for that model are thereby also discussed. The model parmaeters are partially fit from empirical observations of the underlying distribution. The option pricing model then predicts European call prices which fit well to empirical market data over several maturities.
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