Labor Supply and the Extensive Margin
系统考察了劳动力供给的广延边际（是否工作）和集约边际（工作时长）对总工作时间变动的相对重要性，并应用于美国、英国和法国的数据。
In this paper we propose a systematic way of examining the importance of the extensive and the intensive margins of labor supply in order to explain the overall movements in total hours of work over time. We show how informative bounds can be developed on each of these margins. We apply this analysis to the evolution of hours of work in the US, the UK, and France and show that both the extensive and intensive margins matter in explaining changes in total hours.