Working long hours: less productive but less costly? Firm-level evidence from Belgium

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 with hours and where the firm faces labour costs per worker that are invariant to the number of hours worked: i.e. quasi-fixed labour costs. Using Belgian firm-level data on production, labour costs, workers and hours, and focusing of the estimation of workers/hours elasticities of isoquant and isocost, we... Mehr ...