If the firm is perfectly competitive, it would charge price Pc and supply Qc to our consumer, making no economic profit but producing an allocatively efficient output. If the firm is a "non-price discriminating" monopolist, it would charge price Pm per unit and supply Qm, maximizing profit but producing below the allocatively efficient level of output Qc. This situation yields economic profit for the firm equal to the green area B, consumer surplus equal to the light blue area A, and a deadweight loss equal to the purple area C.