Arne Robert Weiss University of Cologne   Aachener Straße 217 Building: 210 B Köln, 50931 Germany   arne.weiss@wiso.uni-koeln.de   http://www.behavecon.uni-koeln.de/15184.html           JEL Areas: C9 : Design of Experiments: General D7 : Analysis of Collective Decision-Making: General