The average cost curve and the variable revenue curve are two lines which intersect at level of output when the firm is supplying and that business is earning zero economic profits.
If the price which the firm is charging from customer is higher than its average cost of production for the quantity of the goods produced, then the firm will earn profits to a large extent.
Conversely, if the price which is charged by the firm is lower than its average cost of production, the firm will suffer losses.
Thus when the cost is equal to the revenue of the firm it means there is no profit at all. At this level the average cost curve will intersect the revenue curve.
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