Multiple Choice
In the figure given below,D1 and S1 are the private demand and supply curves,of a commodity produced by a competitive firm.S2 reflects the social marginal cost of production,while S0 represents the external marginal cost. 
-In Figure 20-1,the marginal external cost at the equilibrium output level is:
A) $0.
B) $40.
C) $10.
D) $28.
Correct Answer:

Verified
Correct Answer:
Verified
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