14. Under Jencks’s proposal, the value of the voucher to the school would vary inversely with the family income of the student, and schools participating in the system would be prohibited from charging tuition beyond the voucher. Thus school would have an incentive to enroll low-income children. The more expensive private schools would have either have to cut their budgets or cater only to those rich enough to forgo the voucher and pay the full costs themselves. This may sound attractive on paper, but one wonders about the political saleability of a plan that would allow parents to shop around for the ”best” school, but prohibit them from spending any additional funds on their children’s education