1. ETH Zurich, D-MTEC, Kreuzplatz 5, 8032 Zurich, Switzerland
2. Laboratorio di Economia e Management (LEM), Scuola Superiore Sant'Anna, Piazza Martiri della Liberta 33, 56127 Pisa, Italy
3. Swiss Finance Institute, c/o University of Geneva, 40 blvd. Du Pont d'Arve, 1211 Geneva 4, Switzerland
4. Economics Department, European University Institute, Via della Piazzuola 43, 50133 Firenze, Italy
5. Instituto Valenciano de Investigaciones Economicas, C/Guardia Civil 22 esc. 2 no 1, 46020 Valencia, Spain
6. Institute of Mathematical Behavioral Sciences, University of California, 3151 Social Science Plaza, Irvine, California 92697, USA