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Why would the fact that the loans are now from the government mean that universities no longer had to compete on costs?I think an economist would say that the loans increase the number of "customers" who could now afford to go to college. Accordingly, when the demand increases faster than the supply, an economist would say increases prices are the result. There's an old op-ed by former Education Secretary William Bennett that gave rise to the "Bennett Hypothesis", where he said,
"If anything, increases in financial aid in recent years have enabled colleges and universities blithely to raise their tuitions, confident that Federal loan subsidies would help cushion the increase … Federal student aid policies do not cause college price inflation, but there is little doubt that they help make it possible."
However, I've casually seen a bit of research that refutes this claim and instead states the primary driver of tuition increases is reduced public funding.