ABSTRACT
Along tradition in economics suggests that treating resources as a commons that are shared jointly by many users could lead to overexploitation in the absence of some kind of access rationing (Ostrom et al. 2002). Since the atmosphere is one such commons, it is not surprising to find that in the absence of some kind of access rationing for polluters, the atmosphere would be excessively polluted. The policy question, therefore, is what form should the control over access take?
