We thank seminar and conference participants at Chicago IO+, Yale, Penn, Princeton, Toronto, UT-Austin, KU Leuven, UNC, Wisconsin, Stanford, Northwestern, Pontificia Universidad Católica de Chile, Universidad de Chile, UC Berkeley, UCLA, UCSC, UBC, NBER IO, IIOC, and the FTC Micro Conference for comments. This paper would not be possible without Hugh McCartney’s contribution in sourcing…