The problem is, “college” isn’t an undifferentiated product. Companies can’t hire enough mechanical engineers, but there’s no bidding war for majors in Fine Arts or Women’s Studies, degrees that cost just as much, but deliver a lot less in terms of employment. In an economically rational market, it would be harder to borrow money to finance fields of study that were unlikely to produce enough income to pay back the loans. But since the federal government subsidizes everything -- and makes student loans un-dischargeable in bankruptcy -- there’s no incentive for lenders to care, and even less incentive for colleges and universities to care. They get their money up front, after all -- just like the people who wrote the subprime loans that fueled the housing crisis.