The study of stable coalition structures, or more generally of coalition formation, was conducted mainly within the framework of games in coalitional form. The most commonly used stability concept is the coalition-structure core, which extends individual stability to group stability. The...

In this paper we investigate the question of how many coalitions of a given relative size would block a non-Warlasian allocation in large finite economies. It is shown that in finite economies, if a Pareto optimal allocation is bounded away from being Walrasian, then, for any two numbers...