What is line "C" pointing to? 
Definitions:
Average Costs
The total costs of production divided by the quantity of output produced, representing the cost per unit of output.
Output
The quantity of goods or services produced by a firm or industry within a certain period.
Declines
Decreases in the value, amount, or quality of something.
Zero Slope
A horizontal line on a graph, indicating that there is no change in the y-value (vertical) regardless of the change in the x-value (horizontal); it represents a constant function.
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