I would like to see the numbers. I want to believe schooling really "changes lives" like the universities selling student loans want you to believe (I myself being a victim of this). However, I have a sneaking suspicion that if we took a cohort of high school students who weren't particularly interested in so-called hard learning and taught them valuable trade work it would have a similar effect. Sure, you can wrap trades in education to make your point, but I think GPs point was that formal beyond high school education is what lifts people out of poverty.