Multiple Choice
In the figure given below,the competitive supply curve of a commodity is given by S1,the private marginal benefit curve is D1,the marginal social benefit curve is D2,and the MBE curve reflects the marginal external benefits. 
-In Figure 20-2,if the efficient output is being produced,the market price of the commodity must be:
A) $12.
B) $17.
C) $20.
D) $24.
Correct Answer:

Verified
Correct Answer:
Verified
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