在过去30年间偏向技能的技术变革推动了就业和工资两方面的两极分化，导致中层劳动者实际工资水平停滞不前，无大学文凭劳动者的实际收入大幅下降。
Over the last 30 years or so, skill-biased technological change has fueled the polarization of both employment and wages, with median workers facing real wage stagnation and non-college-educated workers suffering a significant decline in their real earnings.