Well here is a very interesting analysis that concludes better teachers show very little if any statistical differences in the outcomes of their students: http:

Well here is a very interesting analysis that concludes better teachers show very little if any statistical differences in the outcomes of their students: http://slatestarcodex.com/2016/05/19/teachers-much-more-than-you-wanted-to-know/ http://slatestarcodex.com/2016/05/19/teachers-much-more-than... It really doesn't matter that the teachers in the US are slightly worse, because teachers don't really matter. >What's more, compared to the public school systems of other developed countries, the US one is far from the best and one of the worst in math. These are based on average scores and don't control for race or income. If I recall correctly, if you do control for other factors, similar looking students tend to do about the same between the US and Europe.