An integral equation approach for optimal investment policies with partial reversibility

In this paper we investigate an investment problem with partial reversibility proposed by Abel and Eberly [4]in a finite horizon. In this model, a firm can purchase capital at a given price and sell capital at a lower price. This problem can be categorized into a singular control problem and can be formulated as a Hamilton–Jacobi–Bellman(HJB)equation. Based on theoretical results in [10]and the Mellin transform techniques, we derive the coupled integral equations satisfied by the optimal investment and disinvestment boundaries, respectively. By using the recursive integration method, we solve numerically the integral equations and present the optimal investment boundary and disinvestment boundary.