For helpful comments, I am grateful to Jennifer Gordon, Catherine Fisk, David Moore, and Laura Weinrib. This essay benefitted from presentations at UC Irvine School of Law, BYU J. Reuben Clark Law School, and at The University of Chicago’s Immigration Law and Institutional Design Symposium, held at The University of Chicago Law School on June 15 and 16, 2012. The UC Irvine Law School research librarians provided excellent support. I am also grateful to Morgan White-Smith, Taylor Meehan, and the other University of Chicago Law Review editors for their superb editorial work. Please direct comments and questions to firstname.lastname@example.org.