老师,原版书上有句话我不大理解,希望您能帮我解答下我的疑惑:即An exchange rate's equilibrium path should be determined by the longterm trend in domestic price levels relative to foreign price levels. 这里是不是指real exchange的变化过程由国内外物价对比决定,而非real exchange由国内外物价对比决定,如果是后者我就不理解了,因为real exchange rate和price levels终究没啥关系吧?