MC ATC B AVC E F Demand MR Output per day Refer to the above graph of a profit-maximizing monopoly. The difference in output levels per day between this firm and a profit-maximizing perfectly competitive firm c be measured by the distance between points Output per day Refer to the above graph of a profit-maximizing monopoly. The difference in output levels per day between this firm and a profit-maximizing perfectly competitive firm can be measured by the distance between points A B and C. B F and E C F and C D E and C