22 If the government decides to provide public universities, what tuition fees will these universities charge to achieve the efficient number of students? How much will taxpayers have to pay?

The marginal cost of educating a student is a constant £4,000 a year and the figure shows the students’ marginal benefit curve.
Suppose that university education creates an external benefit of a constant £2,000 per student per year

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Price and cost 5 (thousands of pounds per student per year) 2 3 4 a 0 10 20 30 D= MB 40 50 Quantity (thousands of students per year)