Answer :
In the long run, every purely competitive firm tends to operate at its minimum ATC.
Total Average Cost (ATC)
Total Average Cost (ATC) The average total cost is the total of the average variable and fixed expenses. In other words, it is the total cost divided by the number of units manufactured. Because the marginal cost of producing the next unit of the output always affects the average total cost, the marginal cost curve always intersects the average total cost curve at its lowest point.
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