Pricing Callable Bonds with Stochastic Interest Rate and Stochastic Default Risk: A 3D Finite Difference Model
by David Wang of Hsuan Chuang University
Abstract: This paper presents a 3D model for pricing defaultable bonds with embedded call options. The pricing model incorporates three essential ingredients in the pricing of defaultable bonds: stochastic interest rate, stochastic default risk, and call provision. Both the stochastic interest rate and the stochastic default risk are modeled as a square-root diffusion process. The default risk process is allowed to be correlated with the default-free term structure. The call provision is modeled as a constraint on the value of the bond in the finite difference scheme. This paper can provide new insight for future research on defaultable bond pricing models.
Keywords: Defaultable bond, Embedded option, Partial differential equation, Finite difference method.