One of the very interesting facts is that, in addition, we find that even once we hold constant, statistically, the effect of your own education, the education of everyone else in your metropolitan area also affects your wages.
另外一个非常有趣的事实是 我们发现就算我们在数据上 将你的教育程度对工资的影响保持不变 在都市区里其他人的教育 也会对你的工资产生影响