题目内容

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.

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更多问题

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.

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