On the design of an optimal immigration policy

This paper constructs a model for the study of optimal immigration from the perspective of natives. They have preferences over redistributive transfers, a public good subject to congestion, and over the level of family-based migration. Border enforcement is costly. The model derives conditions for an optimal immigration policy, which balances skill-based against family-based migration, equalizes the fiscal opportunity cost of unauthorized immigration with the marginal cost of enforcement, and balances the effects on transfers against the implied congestion effects. A parameterized version of the model studies the 1994–2008 period and finds legislation projects on immigration consistent with the model's predictions.