[1] Univ St Gallen, Dept Econ, SEW HSG, St Gallen, Switzerland
[2] CESifo, Munich, Germany
[3] CFS, Frankfurt, Germany
[4] IZA, Bonn, Germany
[5] Swiss Finance Inst, Zurich, Switzerland
[6] Swiss Natl Bank, Bern, Switzerland
[7] Univ St Gallen, SEW HSG, Varnbuelstr 14, CH-9000 St Gallen, Switzerland