Also, this problem is a vicious cycle. Bad math students become bad math teachers. I believe that one has to be significantly good at a subject in order to teac

Also, this problem is a vicious cycle. Bad math students become bad math teachers. I believe that one has to be significantly good at a subject in order to teach the basics well. In school I got a feeling that many math teachers did not know a chapter of math beyond what was in the textbook. Doesn't help that in the American economy, good mathematicians can earn 10x more than a math teacher's salary.