Before revision:  For this model, using a latent index framework and the assumption of a stochastic equilibrium selection rule , we prove that the marginal treatment effect from one's own treatment and that from his/her partner 's can be separately point-identified with potential over-identifiability .
After revision:  For this model, using a latent index framework and assuming a stochastic equilibrium selection rule , we prove that the marginal treatment effect from one's own treatment and that from his/her partner 's can be separately point-identified with potential over-identifiability .