They are correlated with income. Of course there's a range of education and income levels in each of these groups, but we find that where there is an investment in education, there is an equalization. One of my slides showed how as education among aboriginals increased, their incomes became more like the average incomes in the population. The same was true for people with disabilities.
I don't know if I'm answering your question. You do see the relationship, and you do see the investment in education paying off in terms of income.