We thank Nour Abdul-Razzak, Scott Ashworth, Regina Austin, Anjelica Hendricks, Dean Knox, Bob Lalonde, Sera Linardi, Philip McHarris, Jonathan Mummolo, Aurelie Ouss, Canice Prendergast, Quitzé Valenzuela-Stookey, and seminar participants at Berkeley, Columbia, Dartmouth, Duke, Florida State, GWU, Stanford, UCL, UCSD Rady, and Yale. We are indebted to Mohammad Abou Harb, Oriana Ballardo, Kiran Misra, and Yvette Wright for their outstanding contributions to this work.
