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,the efficient output is:
A) 700 units.
B) 400 units.
C) 300 units.
D) 0 units.
Correct Answer:

Verified
Correct Answer:
Verified
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