[开课学院]: 商学院 [开课系所]: 经济系 [课程名称]: 公共经济学 [老师名称]: 陈善瑜 老师 [开课学期]: 981 [类型]: 98-1期中考 不可用字典 计算机!! 1.(20%)Imagine a simple economy with only two people,Mark and Judy. a.Suppose the social welfare function is W=Um+2Uj where Um and Uj are the utilities of Mark and Judy,respectively.How would you describe the relative importance assigned to thier respective well-being? b.Suppose that Mark and Judy must split a fixed amount of income of$850.And their utility functions are Um=√Im and Uj=2√Ij where Im and Ij are the incomes of Mark and Judy,respectively. What distribution of the total income between Mark and Judy maximizes social welfare? 2.(20%)Suppose that there are only two fishermen,John and Jack,who fish along a certain coast.They would each benefit if lighthouses were built along the coast where they fish.The marginal cost of building each additional lighthouse is $100. The marginal benefit to John of each additional lighthouse is 90-2Q,and the marginal benefit to Jack is 40-4Q,where Q equals the number of lighthouses. a.Explain why we might not expect to find the efficient number of lighthouses along this coast b.What is the efficient number of lighthouses? What would be the benefits to John and Jack if the efficient number were provided 3.(40%)Consider the story of Bert and Lisa in our textbook.Bert operates a factory that dumps its garbage into a river nobody owns.Lisa makes her living by fishing from the river. a.Show the notion of externality that Bart's optimal ouput might not be the socially efficient output. b.Suppose property rights to the river are assigned to any one of them. Illustrate that by bargining with each other Bart and Lisa can deal with the problem of externalities and produce the socially effcient output. c.Illustrate that goverment deals with the externalities problem by taxes and subsidies. 4.(20%)Compare the two policies,emissions fee and cap-and-trade,in the case of cost changes. 附加连结: (图片请尽量以BBS作图呈现,或简单说明,当然亦可提供相关连结) --

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