Over the last 40 years, collective bargaining by teacher unions has had an enormous impact on public education. And while there continues to be debate whether teachers are fairly compensated, salaries and benefits for teachers have increased over the last four decades while student academic achievement remains flat. Historically, teacher unions have been successful in their vehement opposition to placing weight on student academic performance in teacher evaluations. Yet students in right to work states, where collective bargaining is not required, are out performing their union-educated peers. Additionally, teacher unions have been successful in maintaining tenure policies, which allow poorly qualified teachers to remain in the classroom, affecting student performance not only while in school but also after they graduate.