There are many teachers, it doesn't mean they're all the best and brightest you could get. The best ones I had were people who'd made enough money in industry a

There are many teachers, it doesn't mean they're all the best and brightest you could get. The best ones I had were people who'd made enough money in industry and then switched to teaching for ideological reasons. It doesn't pay enough to be a goal in and of itself for many ambitious people. Teaching being a tenured position after only a couple years also means that many great younger teachers end up getting fired to maintain older checked-out teachers. A lot of adverse selection going on.