1. CERGE-EI, Politických vězňů 7 , Prague 111 21, Czech Republic. e-mail: matej.bajgar@cerge-ei.cz
2. Institute of Economic Studies , Faculty of Social Sciences, Charles University, Opletalova 1606/26, Prague 110 00, Czech Republic
3. ESSEC Business School and THEMA , 3 Avenue Bernard Hirsch, Cergy-Pontoise 95021, France. e-mail: giuseppe.berlingieri@essec.edu
4. Centre for Economic Performance , London School of Economics, Houghton Street, London WC2A 2AE, UK
5. OECD, Directorate for Science, Technology and Innovation , 2, rue André Pascal, Paris 75016, France. e-mail: sara.calligaris@oecd.org and chiara.criscuolo@oecd.org
6. Centre for Economic Performance, London School of Economics , Houghton Street, London WC2A 2AE, UK
7. World Bank , 1818 H Street NW, Washington, DC 20433, USA. e-mail: jtimmis@worldbank.org