The following figure shows the marginal cost curve,average total cost curve,average variable cost curve,and marginal revenue curve for a firm for different levels of output.
Figure 9-3 
-At the profit-maximizing level of output in Figure 9-3,the profit of the firm is equal to the area given by _____.
Definitions:
Ethnicity
A category of people who identify with each other based on shared attributes such as cultural heritage, language, history, or ancestry.
Medium Status
A position or level that is in the middle of a hierarchy or ranking system, neither high nor low.
Group Norms
The shared expectations and rules that guide behavior of people within social groups.
Conform
To align behaviors, attitudes, or beliefs with those of a group, often to fit in or comply with norms.
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