On an Integral Equation for the Free-Boundary of Stochastic, Irreversible Investment Problems

Abstract

In this paper we derive a new handy integral equation for the free-boundary of infinite time horizon, continuous time, stochastic, irreversible investment problems with uncertainty modeled as a one-dimensional, regular diffusion X. The new integral equation allows to explicitly find the free-boundary, b, in some so far unsolved cases, as when the operating profit function is not multiplicatively separable and X is a three-dimensional Bessel process or a CEV process. Our result follows from purely probabilistic arguments. Indeed, we first show that b(X(t))=l*(t), with l*(t) the unique optional solution of a representation problem in the spirit of Bank-El Karoui [Ann. Probab. 32, pp. 1030-1067, (2004)]; then, thanks to such an identification and the fact that l* uniquely solves a backward stochastic equation, we find the integral problem for the free-boundary.