11th OG-96

96 Commentator: The theory of trade retaliation states that countries closed out of any of another country's markets should close some of their own markets to the other country in order to pressure the other country to reopen its markets. If every country acted according to this theory, no country would trade with any other.

The commentator's argument relies on which of the following assumptions?

(A) No country actually acts according to the theory of trade retaliation.
(B) No country should block any of its markets to foreign trade.
(C) Trade disputes should be settled by international tribunal.
(D) For the two countries, at least one has some market closed to the other.
(E) Countries close their markets to foreigners to protect domestic producers.

正确选项是D

如果用无关选项排除， 我确实可以选出正确答案。 但是我不知道这个题目的逻辑思路是怎么样的。 而且我觉得不需要别的assumption， 题目的推论也成立的。 希望解惑！ 谢谢

正确选项是D

如果用无关选项排除， 我确实可以选出正确答案。 但是我不知道这个题目的逻辑思路是怎么样的。 而且我觉得不需要别的assumption， 题目的推论也成立的。 希望解惑！ 谢谢

the conclusion is "If every country acted according to this theory, no country would trade with any other. "
如果没有一个market被closed的话，就算every country acted according to this theory,  但是因为没有任何一个market is closed out,也就不会导致all the countries retaliate each other that results in all the trading to be closed out. 所以要推出上面的结论no country traded with each other，必须有至少一个market是已经被closed掉的。

That's right!

Thank you!

scale 0-100

at least one = [1,100]

at least one 补集 = 0