First Author:   Irenaeus Wolff University of Konstanz, Thurgau Institute of Economics (TWI) wolff@twi-kreuzlingen.ch   Hauptstrasse 90 Kreuzlingen, 8280, Switzerland   +41716770515(Phone) +41716770515(Fax) http://www.wiwi.uni-konstanz.de/fischbacher/home/staff/dr-irenaeus-wolff/ Second Author: Arne Robert Weiss University of Cologne arne.weiss@wiso.uni-koeln.de   Aachener Straße 217, Building: 210 B Köln, 50931, Germany   +49221470 8666(Phone) +49221 470 8668(Fax) http://www.behavecon.uni-koeln.de/15184.html