The core is reformulated to incorporate the externality typical in strategic form games.  Any coalition of players may deviate by trying to commit to a profile of actions different from a status quo.  The outsiders of the coalition may take a coordinated measure, incentive-feasibly for...

A model of duopoly competition in nonlinear pricing when firms are imperfectly informed about consumer locations is analyzed. A continuum of consumers purchase a variable amount of a product from one of two firms located at the endpoints of the market. At the Nash equilibrium in quantity-outlay...