Andreas Nohn Public Choice Research Centre, Turku, Finland   Institute of SocioEconomics (IAW) Universität Hamburg Von-Melle-Park 5 Hamburg, 20146 Germany   nohn@econ.uni-hamburg.de   http://www.soc.utu.fi/sivustot/pcrc/personnel/nohn/           JEL Areas: C : Mathematical and Quantitative Methods C7 : Game Theory and Bargaining Theory:General