Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
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.