The Evolution of a Legal Rule
---- Acknowledgements -----
We are grateful to Ryan Bubb, Charles Cameron, John Coates, Charles Fried, Nicola Gennaioli, Edward Glaeser, Claudia Goldin, Jack Goldsmith, Oliver Hart, Richard Holden, Louis Kaplow, Lawrence Katz, Daryl Levinson, Thomas Miles, Giacomo Ponzetto, Eric Posner, Joshua Schwartzstein, Jesse Shapiro, Steven Shavell. Holger Spamann, Matthew Stephenson, and Adrian Vermeule for comments, and Carlos Berdejo, Justin Ellis, Nevin Gewertz, and Sean Tu for research assistance. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.