The impact of a minimum wage increase on hours worked: heterogeneous effects by gender and sector

A minimum wage increase could lead to adverse employment effects for certain subgroups of minimum wage workers, while leaving others unaffected. This heterogeneity could be overlooked in studies that examine the overall population of minimum wage workers. In this paper, we test for heterogeneous effects of a minimum wage increase on the hours worked of minimum wage employees in Ireland. For all minimum wage workers, we find that a 10% increase in the minimum wage leads to a one-hour reduction in weekly hours worked, equating to an hours elasticity of approximately −0.3. However, for industry workers and those in the accommodation & food sector, the impact is larger, with elasticity −0.8. We also find a negative impact on the hours worked among men on minimum wage, with no significant effect for women. This is due to the disproportionate number of men working in sectors that show the greatest impact on hours. In line with suggestions from the recent literature, we attempt to identify directly those in receipt of minimum wage using hourly wage data, while also studying the dynamic impact on hours worked over multiple time periods using a fully flexible difference-in-differences estimator.