For their helpful feedback, the authors thank the review team and seminar participants at Andreessen Horowitz, Columba University, Georgia Tech, the INFORMS Auctions and Market Design Seminar, Boston College, Cornell University, École des Hautes Études Commerciales de Paris, Imperial College Business School, Institut Europeen d’Administration des Affaires, London Business School, Northwestern University, the Universidad de Chile (Workshop in Management Science), the University of Bath, the University of Michigan, the University of Oklahoma, and the University of Oxford.