On an integral equation for the free-boundary of stochastic, irreversible investment problems

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. the unique optional solution of a representation problem in the spirit of Bank.El Karoui [Ann. Probab. 32 (2004) 1030.1067]; 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.