Is Addiction "Rational"? Theory and Evidence

Jonathan Gruber and Botond Koszegi

The Quarterly Journal of Economics, 2001, vol. 116, issue 4, 1261-1303

Abstract: This paper makes two contributions to the modeling of addiction. First, we provide new and convincing evidence that smokers are forward-looking in their smoking decisions, using state excise tax increases that have been legislatively enacted but are not yet effective, and monthly data on consumption. Second, we recognize the strong evidence that preferences with respect to smoking are time inconsistent, with individuals both not recognizing the true difficulty of quitting and searching for self-control devices to help them quit. We develop a new model of addictive behavior that takes as its starting point the standard "rational addiction" model, but incorporates time-inconsistent preferences. This model also exhibits forward-looking behavior, but it has strikingly different normative implications; in this case optimal government policy should depend not only on the externalities that smokers impose on others but also on the "internalities" imposed by smokers on themselves. We estimate that the optimal tax per pack of cigarettes should he at least one dollar higher under our formulation than in the rational addiction case.

Date: 2001
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