The causation is probably the reverse. Parents who send their kids to college make more money. And that's possibly indirect through the fact that people who go

The causation is probably the reverse. Parents who send their kids to college make more money. And that's possibly indirect through the fact that people who go to college earn more money, so we're probably seeing the effect of having well-educated parents. It would be really interesting to see if income plays a part once you control for parental education levels. Segment by both parents have college degrees, one parent has a degree and neither parent has a degree. We'd probably see a much weaker correlation with income at that point.