First Author:   Alfred Greiner University of Bielefeld, Department of Economics agreiner@wiwi.uni-bielefeld.de   P.O. Box 100131, D-33501 Bielefeld, Germany Bielefeld, Germany   +49 521 106 4859(Phone) +49 521 106 4859(Fax) Second Author: Jens J. Krueger Friedrich-Schiller-University Jena, Department of Economics jens.krueger@wiwi.uni-jena.de   Carl-Zeiss-Str. 3, D-07743 Jena, Germany Jena, Germany   +49 3641 943 203(Phone) +49 3641 943 202(Fax)