Discounting the Benefits and Costs of Environmental Regulations

Abstract

This paper develops a two-stage procedure for discounting the benefits and costs of environmental regulations that is a variant of the shadow price of capital approach. Under this approach, the capital costs imposed by a regulation are annualized using the marginal rate of return on capital and then both benefits and costs are discounted using the social rate of time preference. This approach yields results that differ significantly from those of conventional discounting when benefits occur with a substantial lag or when benefits are long term.