1. Department of Economics, Saarland University, PO Box 15 11 50, 66041, Saarbruecken, Germany
2. Department of Economics, WHU–Otto Beisheim School of Management, Burgplatz 2, 56179, Vallendar, Germany
3. Europa-Universität Viadrina, Lehrstuhl VWL, insb. Makroökonomie, Große Scharnstr. 59, 15230 Frankfurt (Oder), Germany