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The counterpart for education would be to “buy” a share in an individual’s earning prospects: to advance him the funds needed to finance his training on condition that he agree to pay the lender a specified fraction of his future earnings. In this way, a lender would get back more than his initial investment from relatively successful individuals, which would compensate for the failure to recoup his original investment from the unsuccessful.
There seems no legal obstacle to private contracts of this kind, even though they are economically equivalent to the purchase of a share in an individual’s earning capacity and thus to partial slavery.

THE ROLE OF GOVERNMENT IN EDUCATION by Milton Friedman (1955)
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