The Effects of Teachers’ Unions on the Gender Pay Gap among U.S. Public School Teachers

This study examines the effect of teachers’ unions on the gender pay gap among teachers under various legal environments, using nationally representative district–teacher matched data. To identify union effects, I employ propensity score matching, considering both contractual status and teacher union density in each district as a treatment. I find that teachers’ unions significantly reduce the gender pay gap, and the union effects vary by legal environment. I also find that unions reduce teacher attrition for female teachers, but not for male teachers, thereby decreasing the gender pay gap by helping female teachers accumulate experience.