In a game with positive externalities, such as e.g. the standard environmental externality game used in the analysis of international environmental agreements, the solutions having the property of coalitional internal stability, when they exist, are compared in this paper with the solutions with...

To study the stability of coalitions in the standard game theoretic model of international environmental agreements, two alternative concepts are used: potential internal stability and core stability. Both concepts make use of the possibility of reallocating payoffs within a coalition through...