1. Bart J. Bronnenberg is Professor of Marketing, Tilburg University, Tilburg, Netherlands. A Research Fellow, Centre for Economic Policy Research, London, United Kingdom.
2. Jean-Pierre Dubé is James M. Kilts Distinguished Service Professor of Marketing, University of Chicago Booth School of Business, Chicago, Illinois. Research Associates, National Bureau of Economic Research, Cambridge, Massachusetts.
3. Chad Syverson is George C. Tiao Distinguished Service Professor of Economics, University of Chicago Booth School of Business, Chicago, Illinois. Research Associates, National Bureau of Economic Research, Cambridge, Massachusetts.