majority coalition can be stable, provided that reciprocity is sufficiently strong and widespread. In addition, a stable … minority coalition can exist, even with weak reciprocity preferences. This latter coalition is weakly larger than the maximum …

International climate negotiations have been troubled by mutual mistrust. At the same time, a hope seems to prevail … reciprocity - a preference to repay meanness by meanness and kindness by kindness - their willingness to abate will be conditional … countries have relatively strong reciprocity preferences. No coalition participation is always stable. In addition, a stable …

by a draw from an Ellsberg urn. In a within-subject experiment, subjects make decisions in three different bargaining …