访问过日本的人都知道日本的物价很高，而日本工人的工资和他们的美国同行差不多，结果他们收入的购买力只有美国的1/3，扩展习题7的讨论来解释这个现象。(提示：考虑工资率和非贸易品的价格)
Anyone who has visited Japan knows it is an incredibly expensive place；although Japanese workers earn about the same as their U.S. counterparts，the purchasing power of their incomes is about one-third less．Extend your discussion from question 7 to explain this observation．(Hint：Think about wages and the implied prices of non-traded goods．)