The simple analytics of tobacco taxation with illegal supply

This paper examines the impact of tobacco excise taxes where legal and illegal supplies coexist. The government's objective is to minimize cigarettes smoked in the economy (or to maximize revenue or to minimize illegal activity). It reacts to a competitive illegal supply in an adjoining jurisdiction. A model of consumer choice is used to demonstrate how demand response to tax changes can yield counterintuitive results. While the model mimics the Canadian market, similar situations characterize the US and European markets. A novel element of the paper is the treatment of externalities on the supply side rather than the demand side.