P 214 162

antonia

P 214 162
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?
(D) For any two countries, at least one has some market closed to the other.
能帮我分析一下这道题吗？conclusion 和evidence各是什么？非常不解如何将D推出的。

linsonstudy

句子中讲的是国家对国家之间市场策略，其实the former sentence就已经提到了 trade relation states这个前提，如果没有relation那就不成立了。 而结论：no country would trade with any other是 according to this theory的，那肯定也必须遵循relation这个前提，也就是D的说法了,两个国家之间必须要有一些市场关系。