The crunch will come when higher education is completely unaffordable

Harder for Americans to Rise From Lower Rungs - NYTimes.com: "One reason for the mobility gap may be the depth of American poverty, which leaves poor children starting especially far behind. Another may be the unusually large premiums that American employers pay for college degrees. Since children generally follow their parents’ educational trajectory, that premium increases the importance of family background and stymies people with less schooling."

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