Poor people apparently have lower college completion rates, which confirms prior intuition: poor families may not be able to pay the cost of education, or other burdens of poverty such as bad health may make it difficult to complete college.
It’s a vicious circle: poverty makes it harder to get an education, and lack of a good education makes it more likely that you are poor. Unsurprisingly, average income is substantially different for people of different education levels, with high average incomes practically a prerogative for the better educated: