Teaching quality and bargaining

The Economist:

SCOTT LEMIEUX passes along a pretty useful point to keep in mind, courtesy of his friend Ken Sherrill.
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 – 44thIf you are wondering, Wisconsin, with its collective bargaining for teachers, is ranked 2nd in the country.
As Mr Lemieux says, this doesn’t show that collective bargaining makes school systems better. But it makes it pretty hard to argue the converse.