For a firm in monopolistic competition, define efficient scale and excess capacity. Briefly explain each

What will be an ideal response?

The efficient scale is the quantity produced when average total cost is at its minimum. In the long run, a firm in monopolistic competition operates below the efficient scale when maximizing profits. The difference between the efficient scale and the quantity produced by a firm is the excess capacity. Because the firm is not producing at the efficient scale, its average total cost is higher than if it produced at the efficient scale.