Christian Keuschnigg University of St. Gallen (FGN HSG), CEPR, CESifo, Netspar   FGN-HSG FGN-HSG Varnbüelstrasse 19 St. Gallen, CH-9000 Switzerland   christian.keuschnigg@unisg.ch   http://www.fgn.unisg.ch/keuschnigg           JEL Areas: H0 : Public Economics: General J0 : Labor and Demographic Economics: General