Leonhardt says that cost isn't the main problem with college:

If policy makers began to tie funding to performance both graduation rates and measures of actual learning we might not drive down the cost of the good colleges. But I bet we’d stop wasting so much money on colleges that are doing their students a disservice. And I bet there are more of these colleges than we care to admit. With better data on learning, we could also figure out how to evaluate new kinds of schools that may indeed be cheaper than traditional colleges are.

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