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Taylor, Black and Scholes: series approximations and risk management pitfalls

Arturo Estrella

No 9501, Research Paper from Federal Reserve Bank of New York

Abstract: Risk managers make frequent use of finite Taylor approximations to option pricing formulas, particularly of first and second order (delta and gamma). This paper shows that for a plausible range of parameter values, the Taylor series for the Black-Scholes formula diverges. Using a numerical technique developed in the paper, it is also shown that even when the series converges, finite approximations of very large order are generally necessary to achieve acceptable levels of accuracy. Implications for risk management and stress testing are discussed.

Keywords: Options (Finance); Risk (search for similar items in EconPapers)
Date: 1995
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Published in Risk measurement and systemic risk: joint central bank research conference (1995: November 16-17)

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