The graph of a cost function is given in the following figure. Estimate the value of q at which average cost is minimized. 
Definitions:
Market Price
The existing rate at which an item or service may be traded or acquired in a commercial setting.
Market Output
The total amount of goods or services produced and offered for sale by businesses in a particular market.
External Costs
Costs that are not borne by the producer or consumer of a good or service but by society, such as pollution.
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