问题: Cigarettes are supplied by a competitive industry which is in long run equilibrium. Cigarettes sell for $2 a pack. One cigarette company is named Camel. One day, the price of raw tobacco falls(cigarettes are made from raw tobacco) but at the same time, the government begins requiring each cigarette company to pay $10000 a year for a license to sell cigarettes. a. In the short run, what happens to the price of cigarettes, the total number of cigarettes smoked, the number of Camel cigarettes smoked, and the number of firms in the industry? b. Suppose that in the long run, as a result of the combined changes, the price of cigarettes happens to return exactly to $2 a pack. In the long run, what has happended to the total number of cigarettes smoked, the number of Camel cigarettes smoked, and the number of firms in the industry? 我的想法: 这题我一直卡在政府课税的$10000跟原料下跌到底谁轻谁重? (也就是不确定short-run supply究竟是往上或往下移动呢) 题目说的"short run" 也是要考虑license fee吗? 有点无从下手 请板友指教了 <(_ _)> --

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