Teachers' unions and school performance: Evidence from California charter schools

JD Matsudaira, RW Patterson - Economics of Education Review, 2017 - Elsevier
We examine the impact of unions on the quality of educational production by studying a
wave of unionization among California charter schools and administrative data on student
achievement. We first present new data showing that unions are much more prevalent
among charter schools than suggested by previous studies. Using a difference-in-
differences identification strategy, we find that unionization increases achievement in
mathematics and has no statistically significant impact on English test scores.
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