Victor Ginsburgh is Honorary Professor of Economics at the University of Brussels, Belgium. He is an author and editor of numerous books and has published papers in the American Economic Review, Econometrica, Journal of Political Economy, Journal of Economic Perspectives, Journal of Economic Theory, Games and Economic Behavior and other leading journals. His most recent publications include the Handbook of the Economics of Art and Culture (2006 and 2013, co-edited with David Throsby) and How Many Languages Do We Need? (2011, with Shlomo Weber).Shlomo Weber is Robert H. and Nancy Dedman Trustee Professor of Economics at Southern Methodist University, Dallas, Texas, USA, and Academic Head at the Center for the Study of Diversity and Social Interactions, New Economic School, Moscow, Russia. His areas of expertise are game theory, public and political economics. He received various prizes, including the Alexander von Humboldt Research Prize for outstanding foreign scientists and the Megagrant Prize from the Russian Ministry of Science and Education. He recently published The Oxford Handbook of the Russian Economy (2013 in English, and 2014 in Russian, co-edited with Michael Alexeev).