Monopolies can maintain super-normal profits in the long run. As with all firms, profits are maximised when MC = MR. In general, the level of profit depends upon the degree of competition in the market, which for a pure monopoly is zero. At profit maximisation, MC = MR, and output is Q and price P. Given that pric
e (AR) is above ATC at Q, supernormal profits are possible (area PABC).
super-normal