This paper characterizes the short- and long-run Cournot equilibrium with heterogeneous firms and stochastic technological change. In our model, firms have different technologies with heterogeneous fixed and variable costs and various degrees of markups. In a framework with homogeneous firms,...

We analyze a two-stage coalition formation game in which the provision of the global public good is not only associated with variable costs but also with fixed costs. We consider the assumptions that signatories share or do not share fixed costs. We show that fixed costs may imply corner...