This is an interesting article by the New York Times :
Pushed to the left by Mr. Sanders’s promises of free college for all, Mrs. Clinton expanded on that plan in July with a proposal that, when fully put in place, would let students with families earning less than $125,000 a year attend public universities free. The campaign estimates this will cost $500 billion over a decade, paid for by closing tax loopholes that benefit the rich.
Although the prospect of free public college sounds enticing for many, private institutions — which account for about a quarter of the higher education landscape in America — are starting to fret. Vast subsidies to public universities would probably lure students away, forcing private colleges to alter their business models to survive.