課程名稱︰經濟學乙一 課程性質︰共同必修 課程教師︰江瑞祥 開課學院：社會科學院 開課系所︰政治系 考試日期（年月日）︰99年1月15日 考試時限（分鐘）：120 是否需發放獎勵金：是 （如未明確表示，則不予發放） 試題 : National Taiwan University, Department of political Science Economics I, Final Exam 2009 1.Janet knows that she will ultimately face retirement. Assume that Janet will experience two periods in her life, one in which she works and earns income, and one in which she is retired and earns no income. Janet can earn $250,000 during her working period and nothing in her retirement period. She must both save and cosume in her work period and can earn 10 percent interest on her savings. A.Use a graph to demonstrate Janet's budget constraint.(5) B.On your graph, show Janet at an optimal level of consumption in the work period equal to $150,000. What is the implied optimal level of consumption in her retirement period?(5) C.Now, using your graph from part B above, demonstrate how Janet will be affected by an increase in the interest rate on savings to 14 percent. Discuss the role of income and substitution effects in determining whether Janet will increase, or decrease her savings in the work period.(10) 2.The government often intervenes when private markets fail to provide an optimal level of certain goods and services. For example, the government imposes an excise tax on gasoline to account for the negative externality that drivers impose on one another. Why might the private market not reach the socially optimal level of traffic without the help of government?(10) ---------------------------------------------------------------------------- Numbers of workers Output Fixed cost Variable cost Total cost ---------------------------------------------------------------------------- 0 0 $50 $0 $50 1 90 $50 $20 $70 2 170 $50 $40 $90 3 230 $50 $60 $110 4 240 $50 $80 $130 ---------------------------------------------------------------------------- A.Refer to Table. The marginal product of the second worker is?(4) B.Refer to Table. The marginal product of the third worker is?(4) C.Refer to Table. The marginal product of the fourth worker is?(4) D.Refer to Table. At which number of workers does diminishing marginal product begin?(4) E.Refer to Table. If the firm can sell its output for $1 per unit, what is the profit-maximizing level of output?(4) 4.Black Box Cable TV is able to purchase an exclusive right to sell a premium movie channel (PMC) in its market area. Let's assume that Black Box Cable pays $150,000 a year for the exclusive marketing rights to PMC. Since Black Box has already installed cable to all of the homes in its market area, the marginal cost of delivering PMCto subscribers is zero. The manager of Black Box needs to know what price to charge for the PMC service to maximize her profit. Before setting price, she hires an economist to estimate demand for the PMC service. The economist discovers that there are two types of subscribers who value premium movie channels. First are the 4,000 die-hard TV viewers who will pay as much as $150a year for the new PMC premium channel. Second, the PMC channel will appeal to about 20,000 occasional TV viewers who will pay as much as $20 a year for a subscription to PMC. A.Refer to Scenario. If Black Box Cable TV is unable to price discriminate, what price will it choose to maximize its profit, and what is the ammount of the profit?(3) B.Refer to Scenario. If Black Box Cable TV is able to price discriminate, what would be the maximume ammount of profit it could generate?(4) C.Refer to Scenario. What is the deadweight loss associated with the nondiscr- iminating pricing policy compared to the price iscriminating policy?(3) D.One exmple of price discrimination occursin the publishing industry when a publisher initially releases an expensive hardcover edition of a popular novel and later releases a cheaper paperback edition. Use the benefits and potential pitfalls of a price discrimination pricing strategy.(5) 5.圖畫不出來 囧> 6.Imagine a small town in which only two residents, Lisa and Mark, own wells that produce safe drinking water. Each week Lisa and Mark work together to decide how many gallons of water to pump. They bring the water to town and sell it at whatever price the market will bear. To keep things simple, suppose that Lisa and Mark can pump as much water as they want without cost so that the marginal cost of water equals zero. The weekly town demand schedule and total revenue schedule for water is shown in the table below: -------------------------------------------------------------------- Quantity(in gallons) Price Total Revenue(and Total Profit) -------------------------------------------------------------------- 0 $120 $0 100 110 11,000 200 100 20,000 300 90 27,000 400 80 32,000 500 70 35,000 600 60 36,000 700 50 35,000 800 40 32,000 900 30 27,000 1,000 20 20,000 1,100 10 11,000 1,200 0 0 -------------------------------------------------------------------- A.Refer to table. If Lisa and Mark operate as a profit-maximizing monopoly in the market for water, what price will they charge?(5) B.Refer to table. If Lisa and Mark operate as a profit-maximizing monopoly in the market for water, how many gallons of water will be produced and sold?(5) C.Refer to table. If Lisa and Mark operate as a profit-maximizing monopoly in the market for water, how much profit will each of them earn?(5) D.Refer to table. If the market of water were perfectly competitive instead of monopolistic, how many gallons of water will be produced and sold?(5) E.Refer to table. If the market of water were perfectly competitive instead of monopolistic, what price will they charge?(5) --

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