Which of the following terms-of-trade concepts is calculated by dividing the change in a country's export price index by the change in its import price index between two points in time, multiplied by 100 to express the terms of trade in percentages?
A.
Commodity terms of trade
B.
Marginal rate of transformation
C.
Marginal rate of substitution
D.
Autarky price ratio
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举一反三
【单选题】When the generator overloads in an automatic electric power plant, _____.
A.
the stand-by generator set will start and synchronize automatically