Iain Murray highlights part the abstract from a new paper by Cornell researchers:
The earnings estimates for men indicate that teacher collective bargaining reduces earnings by $149.6 billion in the US annually. Among men, we also find evidence of lower employment rates, which is driven by lower labor force participation. Exposure to collective bargaining laws leads to reductions in the skill levels of the occupations into which male workers sort as well. Effects are largest among black and Hispanic men, although white and Asian men also experience sizable negative impacts of collective bargaining exposure. Using data from the 1979 National Longitudinal Survey of Youth, we demonstrate that collective bargaining law exposure leads to reductions in measured cognitive and non-cognitive skills among young adults, and these effects are larger for men.
In other words, exposure to unionized teachers in one way or another tends to reduce boys’ exposure to the skills that men tend more often to need on the job and generally lower abilities, especially in minority populations.
That seems like a data point that ought to be part of the public discussion on education.