1. Department of Economics, University of Zürich, Schönberggasse 1, 8001 Zürich, Switzerland, and CEPR (email: )
2. Department of Finance, Tilburg University, PO Box 90153, 5000 LE Tilburg, The Netherlands, and CEPR (email: )
3. Department of Economics and Finance, LUISS University, Viale Romania 32, 00197 Rome, Italy, EIEF and CEPR (email: )