Does the union wage premium reflect higher hourly pay or hours?
Core argument: The regression-adjusted union differential in weekly wages stands at roughly 15 log points, composed of an hourly wage premium of about 10 log points and longer working hours worth about 5 log points.
The regression-adjusted difference between union members’ and non-members’ hourly earnings has been falling since the Great Recession. The union differential in weekly wages has been more stable. Although it fellby around 5 log points during COVID, it remains 15 log points [roughly 15 ppt]. This weekly earnings differential arises from a higher hourly wage of around 10 log points and longer working hours (5 log points). [Chart 3 above, which includes only the private sector; as the authors note, “The monotonic decline since the late 1970s is driven by decline in the private sector, whereas density has remained relatively stable in the public sector”]. A recent literature indicates that many workers wish to work more hours than their employer offers them. What is perhaps most striking is the [apparent] role unions play in raising hours. It is a [putative] role that has not emerged clearly from the earlier literature but is important for the welfare of workers whose consumption is dependent not only on hourly wages, but the [number of] paid hours of work.


