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Review: Commodities Prices I
Explanation
This question goes after a consideration not much
discussed by the author, which is why certain data was presented in the
passage. The author does say, however, that, "The question is often articulated
in terms of the ratio of total trade volume to the gross domestic product,
since commodity price information is not universally available" (lines 30-33).
By implication, commodities prices would have been used if they had been
available, and the trade volume ratio was used instead because it was
available.
Therefore, the correct answer is (D).
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