Provision of a Public Good with Multiple Dynasties

Larry Karp

Economic Journal, 2017, vol. 127, issue 607, 2641-2664

Abstract: Because carbon emissions create externalities across countries and generations, climate policy requires international cooperation and intergenerational altruism. A differential game using overlapping generations with intergenerational altruism shows how altruism and cooperation interact, and provides estimates of their relative importance in determining equilibrium steady†state carbon levels. A small increase in cooperation has a larger equilibrium effect than a small increase in altruism, beginning at empirically plausible levels. A large increase in altruism may have a larger equilibrium effect, compared to a large increase in cooperation. Climate investments may be dynamic strategic complements, reducing but not eliminating incentives to free ride.

Date: 2017
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