American Options Exercise Boundary When the Volatility Changes Randomly

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The American put option exercise boundary has been studied extensively as a function of time and the underlying asset price. In this paper we analyze its dependence on the volatility, since the Black and Scholes model is used in practice via the (varying) implied volatility parameter. We consider a stochastic volatility model for the underlying asset price. We provide an extension of the regularity results of the American put option price function and we prove that the optimal exercise boundary is a decreasing function of the current volatility process realization.

Original languageEnglish (US)
Pages (from-to)411-422
Number of pages12
JournalApplied Mathematics and Optimization
Issue number2-3
StatePublished - 1999


  • Incomplete markets
  • Optimal stopping
  • Viscosity solutions

ASJC Scopus subject areas

  • Control and Optimization
  • Applied Mathematics


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