How much money should taxpayers spend subsidizing higher education? How willing should students be to take on college debt? How hard should Washington and state governments push colleges to lift their graduation rates? All of these questions depend on whether a large number of at-risk students are really capable of completing a four-year degree.

As it happens, two separate — and ambitious — recent academic studies have looked at precisely this issue.

Learn more: http://www.nytimes.com/2015/04/26/upshot/college-for-the-masses.html