The Evolution of Work in the United States
利用1950至2000年的招聘广告文本，研究发现美国劳动力市场从常规认知和体力任务向非常规互动和分析任务的转变比以往研究显示的更大，且大量变化发生在狭窄定义的职位内部。
Using the text from job ads, we introduce a new dataset to describe the evolution of work from 1950 to 2000. We show that the transformation of the US labor market away from routine cognitive and manual tasks and toward nonroutine interactive and analytic tasks has been larger than prior research has found, with a substantial fraction of total changes occurring within narrowly defined job titles. We provide narrative and systematic evidence on changes in task content within job titles and on the emergence and disappearance of individual job titles.