Bettina Klose University of Zurich   Blümlisalpstrasse 10 Zurich, 8006 Switzerland   bettina.klose@econ.uzh.ch   http://www.econ.uzh.ch/faculty/klose.html           JEL Areas: D7 : Analysis of Collective Decision-Making: General C7 : Game Theory and Bargaining Theory:General