He used to point at schools. He has since figured out that school improvement isn't the fix, and especially that throwing money at schools isn't a fix.<p>He now points at household income.<p>These are just things that happen to correlate with whatever is causing behavioral differences. I've known two poor families whose kids did fine, but those poor families were DIFFERENT from the cultural norms surrounding them. One had a mother with a fierce passion for pestering teachers, pushing to get her kid into advanced programs, and getting her kids to work hard. The other was a strict homeschooling family. Both of those families would not accept anything less than the very best that was possible.<p>It is easy to suggest throwing money at the situation, but the problems are not due to lack of money. Even properly describing the problems is awkward, getting into things that are awkward to discuss.