Abstract
Many environmental regulations impose limits on harmful activities yet include discretionary “safety valve” provisions allowing the regulator to grant exemptions that provide relief to regulated parties. We construct a theoretical model and explore cases in which this discretion serves good or ill. We show that when a regulation is otherwise inflexible, exemptions can improve social welfare, and perhaps reduce pollution, by distributing abatement more cost-effectively across polluters. However, these beneficial predictions rely on an unconstrained, fully informed, and benevolent regulator. In other cases, exemptions may not offer such gains; further, the discretionary nature of exemptions allows them to be abused.
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