One interesting thing I saw recently was that it might be the case that students in "better" education systems might also be doing well because they were going

One interesting thing I saw recently was that it might be the case that students in "better" education systems might also be doing well because they were going to do well regardless. From a semi-recent slatestar link thread[0] (Tyler Cowen is Marginal Revolution): "Tyler Cowen makes the case that Denmark’s institutions aren’t that great because Danes in the US do better than Danes in Denmark, suggesting Denmark is a successful country mostly because of Danish culture (Cowen didn’t mention genes, but should have)." [0]:https://www.bloomberg.com/view/articles/2016-08-16/denmark-s-nice-yes-but-danes-live-better-in-u-s https://www.bloomberg.com/view/articles/2016-08-16/denmark-s...