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A liability approach to climate policy: A thought experiment

Billette de Villemeur, Etienne and Leroux, Justin (2016): A liability approach to climate policy: A thought experiment.

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We observe that a Pigovian climate policy need not exact full payment of the social cost of carbon upon emission to yield optimal incentives. Following this insight, we propose the creation of a carbon liabilities market to address climate change. Each period, countries would be made liable for their share of responsibility in current climate damage. This yields first-best emissions patterns. Also, because liabilities could be traded like financial debt, it decentralizes the choice a discount rate as well as beliefs about the severity of the climate problem. From an informational standpoint, implementation relies only on realized harm and on the well-documented emission history of countries, unlike a carbon tax or tradable permits scheme, which are based on a sum of discounted expected future marginal damage. We offer a discussion of the differences between a liability scheme and a carbon tax along the dimensions of information, participation, commitment, intergenerational fairness, and exposure to risk.

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