Subsidies to industry and the environment

"Governments support particular firms or sectors by granting low interest financing, reduced regulation, tax relief, price supports, monopoly rights, and a variety of other subsidies. Previous work in partial equilibrium shows that subsidies to environmentally sensitive industries increases output and pollution emissions. We examine the environmental effects of subsidies in general equilibrium. Since all resources are used, whether or not subsidies increase emissions depends on the relative emissions intensity and incentives to emit of the subsidized industry versus the emissions intensity and the incentives to emit of the industry which would otherwise use the resources. Since subsidies must move resources to a less productive use, the economy wide marginal product of emissions falls with an increase in any subsidy, tending to decrease emissions. On the other hand, subsidies tend to move resources to more emissions intensive industries. Thus, subsidies increase pollution emissions if resources are moved to an industry for which emissions intensity is high enough to overcome the reduction in emissions caused by lower overall marginal product of emissions. We show that, under genera