Pricing equity derivatives subject to bankruptcy

Vadim Linetsky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

We solve in closed form a parsimonious extension of the Black-Scholes-Merton model with bankruptcy where the hazard rate of bankruptcy is a negative power of the stock price. Combining a scale change and a measure change, the model dynamics is reduced to a linear stochastic differential equation whose solution is a diffusion process that plays a central role in the pricing of Asian options. The solution is in the form of a spectral expansion associated with the diffusion infinitesimal generator. The latter is closely related to the Schrödinger operator with Morse potential. Pricing formulas for both corporate bonds and stock options are obtained in closed form. Term credit spreads on corporate bonds and implied volatility skews of stock options are closely linked in this model, with parameters of the hazard rate specification controlling both the shape of the term structure of credit spreads and the slope of the implied volatility skew. Our analytical formulas are easy to implement and should prove useful to researchers and practitioners in corporate debt and equity derivatives markets.

Original languageEnglish (US)
Pages (from-to)255-282
Number of pages28
JournalMathematical Finance
Volume16
Issue number2
DOIs
StatePublished - Apr 2006

Keywords

  • Asian options
  • Bankruptcy
  • Brownian exponential functionals
  • Credit risk
  • Credit spread
  • Hazard rate
  • Implied volatility skew
  • Schrödinger operator with Morse potential
  • Spectral expansions
  • Stock options

ASJC Scopus subject areas

  • Accounting
  • Finance
  • Social Sciences (miscellaneous)
  • Economics and Econometrics
  • Applied Mathematics

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