Figure 151 Figure 15

Figure 15.1 Figure 15.1 shows a market with an externality.The current market equilibrium output of Q₁ is not the economically efficient output.The economically efficient output is Q₂.
-Refer to Figure 15.1.Suppose the current market equilibrium output of Q₁ is not the economically efficient output because of an externality.The economically efficient output is Q₂.In that case, the diagram shows

A) the effect of a positive externality in the production of a good.
B) the effect of a negative externality in the production of a good.
C) the effect of an external cost imposed on a producer.
D) the effect of an external benefit such as a subsidy granted to consumers of a good.