My friend Ken Sherrill sends along the following note:

Only 5 states do not have collective bargaining for educators and have deemed it illegal. Those states and their ranking on ACT/SAT scores are as follows: South Carolina – 50th

North Carolina – 49th

Georgia – 48th

Texas – 47th

Virginia – 44th If you are wondering, Wisconsin, with its collective bargaining for teachers, is ranked 2nd in the country. Let’s keep it that way .

This isn’t to say that the lack of collective bargaining explains these poor outcomes, of course, but it is true that the evidence that breaking teacher’s unions improves educational outcomes is somewhere between “exceptionally weak” and “non-existent.”

[Link]

UPDATE: Sherrill now notes that this was based on faulty data, so I retract the claim. I stand behind the claim that there’s essentially no evidence that eliminating teacher’s unions improves educational outcomes, but this was the wrong way to make the point.

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