The gravity model suggests that over time
A. world trade will eventually be swallowed by a black hole.
B. the value of trade between two countries will be proportional to the product of the two countries' GDP.
C. trade between Earth and other planets will become important.
D. trade between all countries will increase.
查看答案
According to the gravity model, a characteristic that tends to affect the probability of trade existing between any two countries is
A. their cultural affinity.
B. the average weight/value of their traded goods.
C. the distance between them.
D. the number of different product varieties produced by their industries.
Why does the gravity model work?
A. Large economies became large because they were engaged in international trade.
B. Large economies tend to have large incomes and tend to spend more on imports.
C. Large economies have relatively large incomes, and hence spend more on government promotion of trade and investment.
D. Large economies tend to avoid trading with small economies.
根据引力模型，其他条件不变，两个国家间的贸易与两国的GDP成正比，与两国的距离成反比
A. 对
B. 错
加拿大和澳大利亚都是英语国家，人口规模也相当，加拿大多60%，但是相对各自GDP 而言，加拿大的贸易额是澳大利亚的两倍。为什么会如此？
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