Suppose that in the process of production, Energy Incorporated emits large amounts of sulfur dioxide into the atmosphere. This is an example of:
A.	a marginal social cost.
B.	a marginal cost.
C.	a marginal external cost.
D.	a private external cost.
Answer:C
Suppose that in the process of production, Energy Incorporated emits large amounts of sulfur dioxide into the atmosphere. This is an example of:
A.	a marginal social cost. B.	a marginal cost. C.	a marginal external cost. D.	a private external cost.