PPP holds better for ________ countries

In the figure above, suppose the government provides vouchers worth $15,000 per student per year. Then the market equilibrium occurs at a tuition of ________ a year and ________ million students

A) $10,000; 15 B) $25,000; 15 C) $15,000; 15 D) $15,000; 7.5 E) $20,000; 20

If consumption of a good creates positive externalities, then

a. the market will under produce it b. the market will over produce it c. the market must be perfectly competitive d. the market must be constrained by barriers to entry e. the market will produce the most efficient quantity