On Uniqueness of coalitional equilibria

For the so-called "new approach" of coalitio formation it is important that coalitional equilibria are unique. Uniqueness comes down to existene and to semi-uniqueness, i.e.\\that there exists at most one equilibrium. Although conditions for existence are not problematic, conditions for semi-uniqueness are. We provide smi-uniqueness conditions by deriving a new equilibrum semi-uniqueness result for games in strategic form with higher dimensional strategy sets. The result applies in particular to Cournot-like games