If voters A, B, and C have the following demand curves for a public library Pa = 5 - Q, Pb = 10 - 2Q, and Pc = 15 - 3Q, then social demand for a public library is:

A. P = 15 - Q.
B. P = 30 - 6Q.
C. P = 6 - 30Q.
D. P = 30 - 3Q.


Answer: B

Economics

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Economics