to guarantee internal stability and to maximize the sum of utilities of coalition members. The transfers scheme is tested …, einer Koalition beizutreten oder nicht. Bezüglich der Koalitionäre wird kollektive Wohlfahrtsmaximierung angenommen …, Outsider handeln individuell rational. Für die Aufteilung des durch die Koalition generierten Effizienzgewinns wird ein …

on others' abatement. I show that a full or majority coalition can be stable. This requires, however, that a majority of … countries have relatively strong reciprocity preferences. No coalition participation is always stable. In addition, a stable … minority coalition may exist; if so, it is weakly larger than the maximum stable coalition with standard preferences, but is …

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 … stable coalition with standard preferences, but is characterized by mutually negative sentiments. …