Which of the following is true of the gravity model?
A. The gravity model states that the trade flows between two countries are proportional to the countries' land masses.
B. The gravity model states that the trade flows between two countries are directly proportional to their gross domestic product (GDP).
C. The gravity model states that trade flows between a developing and a developed nation are usually unidirectional.
D. The gravity model emphasizes the role of the government to generate adequate gains from trade.
Answer: B
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