In the year following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent. In contrast, in the year prior to the tax increase, sales had fallen one percent. The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.
Which of the following, if true, would most strengthen the argument above?
During the second year after the tax increase, cigarette sales increased by a significant amount.
The information available to consumers on the health risks of smoking remained largely unchanged in the period before and after the tax increase.
Most consumers were unaware that the tax on cigarettes was going to increase.
During the year following the cigarette tax increase, many consumers had less income, in inflation-adjusted dollars, than they had had in the previous year.
During the year after the tax increase, there was a greater variety of cigarettes on the market than there had been during the previous year.
D反而是他因削弱,因为收入更少了(而不是价格更高了)
增强选项,要控制变量,那种健康意识没变(所以不是健康意识的锅,是有了tax更贵了的锅)
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