国际经济与贸易全英试题(12)

1. (5) Assumption : US is a large country in importing steel. There is same elastisity both importing demand curve and exporting supply curve.（进口需求曲线和出口供给曲线的弹性相同）。

In free trade, US imported steel 100 tons in the price of $100 per ton. Now US imposed $20 tariff on importing steel, and imported 67tons. Question: what is the gain of US from the importing tariff ?

what is the net loss of the whole world ?

S

D

e

0 67 100

e - (b+d) = 670 – 165 = 505

The net loss of the whole world = b+d+f = 330

Q

2. (10) In free trade , steel price is $1000 per unit, including coke（焦炭） 400 and iron ore（铁矿石）500 .

Before entering WTO, the importing tariffs are 100%, 50% and 50%. After entering WTO, the importing tariffs are reduced to 5% (coke)，6% (iron ore )。

Question: After entering WTO, what will be the tariff rate of steel in order to keep ERP constant ?

（入世后，要保持与入世前相同的有效保护率，钢铁的进口税率是多少？）

Before: V’= 1000×(1+100%) – 400×(1+50%) – 500×(1+50%) = 650 V = 1000 – 400 – 500 = 100

REP = (650 – 100 ) ÷ 100 = 5.5 （第一步做对7分） After: suppose the tariff rate of steel is x ,

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