DMCA

We thank the National Science Foundation for financial support. We also thank SECEX/MEDIC and (2012)

by Elhanan Helpman , Oleg Itskhoki , Marc-andreas Muendler , Stephen J. Redding , Sam Bazzi , Lorenzo Casaburi , Itzik Fadlon , Adam Guren , Eduardo Morales , Jesse Schreger For , Carlos Henrique Corseuil , Kerem Cosar , Thibault Fally , Cecilia Fieler , Leo Feler , Gita Gopinath , Gene Grossman , Bo Honore , Ulrich Muller , Andriy Norets , Richard Rogerson , Esteban Rossi-hansberg , Andres Santos , Mine Senses , Chris Sims , John Van Reenen , Jon Vogel , Yoto Yotov , Elhanan Helpman , Oleg Itskhoki , Marc-andreas Muendler , Stephen J. Redding