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A Note on Wick Products and the Fractional Black-Scholes Model

Author

Listed:
  • Björk, Tomas

    (Dept. of Finance, Stockholm School of Economics)

  • Hult, Henrik

    (Department of Applied Mathematics and Statistics)

Abstract

In some recent papers, such as Elliott & van der Hoek, Hu & Öksendal, a fractional Black-Scholes model have been proposed as an improvement of the classical Black-Scholes model. Common to these fractional Black-Scholes models, is that the driving Brownian motion is replaced by a fractional Brownian motion and that the Ito integral is replaced by the Wick integral, and proofs has been presented that these fractional Black-Scholes models are free of arbitrage. These results on absence of arbitrage complelety contradict a number of earlier results in the literature which prove that the fractional Black-Scholes model (and related models) will in fact admit arbitrage. The object of the present paper is to resolve this contradiction by pointing out that the definition of the self-financing trading strategies and/or the definition of the value of a portfolio used in the above cited papers does not have a reasonable economic interpretation, and thus that the results in these papers are not economically meaningful. In particular we show that in the framework of Elliott and van der Hoek, a naive buy-and-hold strategy does not in general qualify as "self-financing". We also show that in Hu and Öksendal, a portfolio consisting of a positive number of shares of a stock with a positive price may, with positive probability, have a negative "value".

Suggested Citation

  • Björk, Tomas & Hult, Henrik, 2005. "A Note on Wick Products and the Fractional Black-Scholes Model," SSE/EFI Working Paper Series in Economics and Finance 596, Stockholm School of Economics.
    • Handle: RePEc:hhs:hastef:0596
    Note: Published in: "Finance and Stochastics", Vol 9, No 2, pp 197-209, (2005).
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    References listed on IDEAS

    as
    1. Fred Espen Benth, 2003. "On arbitrage-free pricing of weather derivatives based on fractional Brownian motion," Applied Mathematical Finance, Taylor & Francis Journals, vol. 10(4), pages 303-324.
    2. Biagini, Francesca & Hu, Yaozhong & Øksendal, Bernt & Sulem, Agnès, 0. "A stochastic maximum principle for processes driven by fractional Brownian motion," Stochastic Processes and their Applications, Elsevier, vol. 100(1-2), pages 233-253, July.
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    More about this item

    Keywords

    Mathematical Finance; Fractional Brownian motion; Arbitrage; option; financial derivatives; wick;
    All these keywords.

    JEL classification:

    • G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)

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