Jean-Fran ois Richard is a Belgian-American economist and Distinguished Professor of Economics at the University of Pittsburgh. He has been awarded the Prix des Alumni de la Fondation Universitaire, is a Fellow of the Econometric Society, and has published more than ninety articles and two books on a broad range of econometrics topics. Robert C. Marshall is Distinguished Professor of Economics at Penn State University. He has published over thirty articles regarding bidder collusion and cartels and is the author, with Leslie M. Marx, of Economics of Collusion (MIT Press). Chaohai Shen is Associate Professor of Economics at East China Normal University. His areas of research include economics of collusion, industrial organization, and applied econometrics.