The Effect of Addiction on Environmental Taxation in a First and Second-best world

We examine the effect of addictive behavior on a socially optimal environmental tax. If utility in part depends on past consumption and individuals are time-consistent, the socially optimal environmental tax is shown to be equal to the conventional Pigovian tax. In a second-best world where the social planner has a restriction on the future environmental tax level, the current optimal tax is no longer equal to the Pigovian tax. We extend the analysis with time-inconsistent (myopic) individuals to both the first (no restriction on future environmental tax) and second-best world (restriction on future environmental tax). Also, the importance of addiction in an environmental framework is discussed.