First, the US is effectively a single labor market, with workers moving from areas of high and rising unemployment to places where jobs are more plentiful. In Europe, national labor markets are effectively separated by barriers of language, culture, religion, union membership, and social-insurance systems.
首先，美国基本上是一个单一劳动力市场，劳动者可以从失业率不断上升的区域向职位想对充裕的地区流动。而在欧洲，各国劳动力市场实际上被语言，文化，宗教，欧盟成员国资格和社保系统等各类障碍割裂开来。