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Pricing Perpetual Put Options by the Black–Scholes Equation with a Nonlinear Volatility Function

Author

Listed:
  • Maria do Rosário Grossinho

    (Universidade de Lisboa)

  • Yaser Kord Faghan

    (Universidade de Lisboa)

  • Daniel Ševčovič

    (Comenius University)

Abstract

We investigate qualitative and quantitative behavior of a solution of the mathematical model for pricing American style of perpetual put options. We assume the option price is a solution to the stationary generalized Black–Scholes equation in which the volatility function may depend on the second derivative of the option price itself. We prove existence and uniqueness of a solution to the free boundary problem. We derive a single implicit equation for the free boundary position and the closed form formula for the option price. It is a generalization of the well-known explicit closed form solution derived by Merton for the case of a constant volatility. We also present results of numerical computations of the free boundary position, option price and their dependence on model parameters.

Suggested Citation

  • Maria do Rosário Grossinho & Yaser Kord Faghan & Daniel Ševčovič, 2017. "Pricing Perpetual Put Options by the Black–Scholes Equation with a Nonlinear Volatility Function," Asia-Pacific Financial Markets, Springer;Japanese Association of Financial Economics and Engineering, vol. 24(4), pages 291-308, December.
    • Handle: RePEc:kap:apfinm:v:24:y:2017:i:4:d:10.1007_s10690-017-9234-1
    DOI: 10.1007/s10690-017-9234-1
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    References listed on IDEAS

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