────────────────────────── Number of │ Marginal cost │ Marginal social │ bus rides │ of bus company │ cost │ per week │(dollars per bus │ (dollars per │ │ ride) │ bus ride) │ ────────────────────────── 100 │ 0.25 │ 1.00 │ ────────────────────────── 200 │ 0.50 │ 1.50 │ ────────────────────────── 300 │ 1.00 │ 2.25 │ ────────────────────────── 400 │ 1.50 │ 3.00 │ ────────────────────────── 500 │ 1.75 │ 5.00 │ ────────────────────────── (1)The demand for bus service is perfectly elastic at a price of $1.00 a ride. The table above shows the bus company's marginal cost and the marginal social cost of the bus service. The competitive quantity of bus rides per week is A)100 B)200 C)300 D)500 Ans:B (2)The demand for bus service is perfectly elastic at a price of $1.25 a ride. The table above shows the bus company's marginal cost and the marginal social cost of the bus service. If the government levies a tax on bus rides so that the bus company takes into account the marginal social cost, the tax will be _____ a ride. A)$0.75 B)$1.60 C)$1.25 D)$3.25 Ans:A 这种题目该如何下手? 我只能想到SMC=MC+外部成本 和社会最适产量决定於P=SMC 然後就卡住了 囧 --

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