1. Imperial College Business School , South Kensington Campus , London, SW7 2AZ, UK
2. ECGI , Brussels, Belgium
3. CEPR , London, UK
4. Nova School of Business and Economics , R. da Holanda 1 , Carcavelos, 2775-405, Portugal
5. Norges Bank , Bankplassen 2. PB 1179 , Oslo, NO-0107. Norway
6. University of Zurich , Rämistrasse 71 , Zurich, 8006, Switzerland