From the point of view of a profit-maximizing firm, the optimal number of working hours depends not only on the marginal productivity of hours but also on the marginal labour cost. This paper develops and assesses empirically a simple model of firms' decision making where productivity varies...

Labour turnover is a crucial element of contemporary economic life. It can improve productivity if more productive workers replace less productive ones. However, in the short run, it generates sizeable labour adjustment costs (LACs), including productivity losses. This paper sheds new light on...