Suppose Campus Books, a profit-maximizing firm, is the only supplier of the textbook for a given class. The marginal cost of supplying each book is constant and equal to $10, and Campus Books has no fixed costs. The table shows the reservation prices of the eight students enrolled in the class. CustomerReservation Price($/Book)Q60R54S48T42U36V30W24X18What is the socially optimal number of books?
A. 6
B. 8
C. 7
D. 5
Answer: B
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