Before revision:  I propose a nonparametric selection model with latent choice sets to relate where access was received to the treatment assignment status, participation decision and outcome, and a linear programming procedure to compute the identified set for parameters evaluating the average effects of program access in this model.
After revision:  I propose a nonparametric selection model with latent choice sets to relate where access was received . I illustrate how a computational procedure can be used to learn about these parameters in this model.