On the Default Probability in a Regime-Switching Regulated Market

This paper considers asset dynamics in a regulated (controlled) market, where the macroeconomic environment is taken into account. A regime-switching reflected stochastic process with two-sided barriers is proposed for modeling asset price dynamics. We study a default problem with the default time being defined as the first passage time of the price dynamics. By solving a pair of interacting ordinary differential equations (ODEs), we obtain an explicit formula for the Laplace transform (LT) of the default time. Some numerical results are given for illustration.