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Critical Transaction Costs And 1-Step Asymptotic Arbitrage In Fractional Binary Markets

Author

Listed:
  • FERNANDO CORDERO

    (Faculty of Technology, University of Bielefeld, Universitätsstrasse 25, Bielefeld 33615, Germany)

  • LAVINIA PEREZ-OSTAFE

    (Department of Mathematics, ETH Zurich, Rämistrasse 101, Zurich 8092, Switzerland)

Abstract

We study the arbitrage opportunities in the presence of transaction costs in a sequence of binary markets approximating the fractional Black–Scholes model. This approximating sequence was constructed by Sottinen and named fractional binary markets. Since, in the frictionless case, these markets admit arbitrage, we aim to determine the size of the transaction costs needed to eliminate the arbitrage from these models. To gain more insight, we first consider only 1-step trading strategies and we prove that arbitrage opportunities appear when the transaction costs are of order $o(1/\sqrt{N})$. Next, we characterize the asymptotic behavior of the smallest transaction costs $\lambda_c^{(N)}$, called "critical" transaction costs, starting from which the arbitrage disappears. Since the fractional Black–Scholes model is arbitrage-free under arbitrarily small transaction costs, one could expect that $\lambda_c^{(N)}$ converges to zero. However, the true behavior of $\lambda_c^{(N)}$ is opposed to this intuition. More precisely, we show, with the help of a new family of trading strategies, that $\lambda_c^{(N)}$ converges to one. We explain this apparent contradiction and conclude that it is appropriate to see the fractional binary markets as a large financial market and to study its asymptotic arbitrage opportunities. Finally, we construct a 1-step asymptotic arbitrage in this large market when the transaction costs are of order o(1/NH), whereas for constant transaction costs, we prove that no such opportunity exists.

Suggested Citation

  • Fernando Cordero & Lavinia Perez-Ostafe, 2015. "Critical Transaction Costs And 1-Step Asymptotic Arbitrage In Fractional Binary Markets," International Journal of Theoretical and Applied Finance (IJTAF), World Scientific Publishing Co. Pte. Ltd., vol. 18(05), pages 1-26.
    • Handle: RePEc:wsi:ijtafx:v:18:y:2015:i:05:n:s0219024915500296
    DOI: 10.1142/S0219024915500296
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    References listed on IDEAS

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    1. Tommi Sottinen, 2001. "Fractional Brownian motion, random walks and binary market models," Finance and Stochastics, Springer, vol. 5(3), pages 343-355.
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    Cited by:

    1. Xiao, Shasha & Wang, Zhanshan & Ma, Lei, 2023. "Synchronization Analysis of Fractional Order Delayed BAM Neural Networks via Multi-Delay-Boundary Inequality," Applied Mathematics and Computation, Elsevier, vol. 451(C).

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