Timo Mennle University of Zurich   Department of Informatics University of Zurich Binzmühlestrasse 14 Zürich, ZH 8050 Switzerland   mennle@ifi.uzh.ch   http://www.ifi.uzh.ch/ce/people/mennle.html           JEL Areas: C7 : Game Theory and Bargaining Theory:General D6 : Welfare Economics: General