Cleo and Bob are two environmentalists who have a demand curve for parks given by the following: Bob: p = 240 – 3Q Cleo: p = 120 - Q Parks are a pure public good and you should assume that the marginal cost of parks is 40. What is the efficient number of parks?
a) 40.
b) 60.
c) 80.
d) 100.
e) None of the above.