We would like to thank Sabrina Considine and Vitor Weiss Jung for excellent research assistance, Sydnee Caldwell, Xavier Gabaix, John Haltiwanger, Joshua Hausman, Seula Kim, Patrick Kline, Ricardo Lagos, Ilse Lindenlaub, Shraddha Mandi, Juan de Mendonca Acevedo, Guido Menzio, Simon Mongey, Amalia Repele, Benjamin Schoefer, Robert Shimer, Anna Stansbury, Ivan Werning, and participants in seminars we have given for useful comments and discussions. We thank the Smith Richardson Foundation for financial support. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.