Graduate school. Half of all student loan debt is held by graduate students. https://www.cnbc.com/2021/07/16/graduate-students-owe-around-50percent-of-all-stude

Graduate school. Half of all student loan debt is held by graduate students. https://www.cnbc.com/2021/07/16/graduate-students-owe-around-50percent-of-all-student-debt.html https://www.cnbc.com/2021/07/16/graduate-students-owe-around... It's also the case that back in the 80s, the elite ultra-expensive schools did not offer generous financial aid like they do now, so middle class kids had to pay themselves.