题干：He notes that current account trends influence the path of exchange rates over time through several mechanisms
“Of the three mechanisms that economists identify, I have the most confidence in the one that assumes there are long-run limits on current account deficits.”
请问A选项是在哪个知识点提到的，完全没有印象；
我做这道题时看到current acount 就选了 flow supply/demand chanel；
答案看的不是非常明白，能否通俗易懂的再解释下，多谢
