Use the following figure to answer the question : Figure 20-1 : 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:
Definitions:
African-American Population
The demographic group in the United States consisting of individuals with partial or total ancestry from any of the black racial groups of Africa.
Georgia
A state located in the southeastern region of the United States, known for its history, culture, and diverse geography.
Arizona
A U.S. state in the Southwestern region known for its desert landscape, the Grand Canyon, and a rich Native American heritage.
California
A U.S. state on the western coast known for its diverse geography, significant economic impact, and cultural influence, as well as being the most populous state.
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