MC和SMC - 經濟

──────────────────────────
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



這種題目該如何下手?
我只能想到SMC=MC+外部成本
和社會最適產量決定於P=SMC

然後就卡住了 囧

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