The accompanying diagram shows the market for cigarettes. The current equilibrium price per pack is $4, and every day 40 million packs of cigarettes are sold. In order to recover some of the health care costs associated with smoking, the government imposes a tax of $2 per pack. This will raise the equilibrium price to $5 per pack and reduce the equilibrium quantity to 30 million packs.

The economist working for the tobacco lobby claims that this tax will reduce consumer surplus for smokers by $40 million per day, since 40 million packs now cost $1 more per pack. The economist working for the lobby for sufferers of second-hand smoke argues that this is an enormous overestimate and that the reduction in consumer surplus will be only $30 million per day, since after the imposition of the tax only 30 million packs of cigarettes will be bought and each of these packs will now cost $1 more. They are both wrong. Why?

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Price of cigarettes (per pack) $8 Excise 5 F.... tax = $2 4 . 30 40 Quantity of cigarettes (millions of packs per day)