题目内容
外部性的存在意味着边际社会成本小于边际私人成本。
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所有的Nash均衡同时也是占优策略(dominant strategy)均衡。
听力原文： Have you ever dreamed of having a fashionable watch of great value？ A small watchmaker in Switzerland in 1922 designed the first automatic watch to show the day, month, and date. Only seven of these splendid watches were ever made and these watches were almost lost to history. Today, it is so hard to get an original watch that some watch historians are even willing to offer $200,000 for one.
These watches attracted a lot of people for their splendid color, fashionable style, and new uses in the 1920s. The owners of the watches were admired and set apart from the crowd. Because the number of the original watches is very limited, owning such a watch will make you feel very special.
Today, you are offered the same kind of watch with improvement. It has a 24-jewel mechanical movement, the kind desired by watch collectors. The watchmaker has made the movement of the watch much more modern with an automatic rotor so that the watch never needs to be wound by hand. The design on it. To get a watch in such a perfect design means to get a chance to know a piece of watch-making history and to wear such a watch will show your personal taste and social position.
You can get the watch either in person or by mail all an affordable price. You will also receive good service from the watch seller. If you are not satisfied with the watch after you get it, you may simply return it within 30 days. Don't miss the chance to realize your dream.
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李嘉图等价定理认为政府利用减税或举债的财政政策刺激经济都是有效的。
审批、许可证等有关政府批文中规定检验检疫地点的，在规定的地点报检。
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