2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/208496Continuous-time mean-variance portfolio selection model with nonlinear wealth equations and bankruptcy prohibition is investigated by the dual method. A necessary and sufficient condition which the optimal terminal wealth satisfies is obtained through a terminal perturbation technique. It is also shown that the optimal wealth and portfolio is the solution of a forward-backward stochastic differential equation with constraints.18 pagesPortfolio ManagementProbability60H30; 60H10text