The Answer Sheet - The real effect of teachers union contracts

The Answer Sheet - The real effect of teachers union contracts: "Out of these 10 states, only one (Virginia) has an average rank above the median, while four are in the bottom 10, and seven are in the bottom 15. These data make it very clear that states without binding teacher contracts are not doing better, and the majority are actually among the lowest performers in the nation.

In contrast, nine of the 10 states with the highest average ranks are high coverage states, including Massachusetts, which has the highest average score on all four tests.

If anything, it seems that the presence of teacher contracts in a state has a positive effect on achievement.

Now, some may object to this conclusion. They might argue that I can’t possibly say that teacher contracts alone caused the higher scores in these states. They might say that there are dozens of other observed and unobserved factors that influence achievement, such as state laws, lack of resources, income, parents’ education, and curriculum, and that these factors are responsible for the lower scores in the 10 non-contract states.

My response: Exactly."

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