In: Economics
Construct two graphs lined up one on top of the other.
the upper graph should reflect a total cost curve and the bottom graph should reflect the average cost curve and the marginal cost curve.
Add a total revenue curve to the upper graph and a marginal revenue curve to the lower graph such that the firm is not making a profit or suffering a loss.
Since the price is equal to average cost,the firm is neither making profit nor loss.
Equilibrium is determined according to MR=MC.