I thank Mitch Berman, David Dolinko, Erik Encarnacion, Russell Korobkin, Jennifer Mnookin, Steve Munzer, Seana Shiffrin, and many other UCLA colleagues for helpful comments. For excellent research assistance, I am grateful to Sarah Burns, Jennifer Erickson, Zak Fisher, Ricky Fox, Martin Gandur, Shahin Mohammadi, Bronson Van Opijnen, and Jordan Wolf.