On November 8, 2018, the 11th Annual Kenneth J. Arrow Lecture was delivered by Alvin Roth, the 2012 Nobel Laureate in Economic Sciences and Craig and Susan McCaw Professor of Economics at Stanford University, on "Market Design in Large Worlds: The Example of Kidney Exchange." Discussants: Parag Pathak, Jane Berkowitz Carlton and Dennis William Carlton Professor of Microeconomics at MIT and Joseph E. Stiglitz, 2001 Nobel Laureate in Economic Sciences and University Professor at Columbia University.