1. Department of Economics, University of Rostock, Ulmenstr. 69, D-18057 Rostock, Germany
2. Kiel Institute for the World Economy, Kiellinie 66, D-24105 Kiel, Germany
3. University Medical Center, University of Rostock, Gelsheimer Str. 20, D-18147 Rostock, Germany
4. Department of Economics, Lund University, Box 7080, S-220 07 Lund, Sweden
5. CESifo Munich, Poschingerstr. 5, D-81679 Munich, Germany