According to economists who accept the Schumpeter hypothesis,

a. a monopoly will produce less output than a perfectly competitive firm.

b. a monopoly will sacrifice economic profit in the short run to produce more efficiently, thereby assuring greater economic profit in the long run.

c. a monopoly may end up selling at a lower than perfectly competitive price if there are increasing returns to scale.

d. one perfectly competitive firm will ultimately become a monopoly, because success will weed the inefficient ones out of the industry.

e. in the long run, monopolistically competitive firms will ultimately become perfectly competitive, because the goods they produce become perfect substitutes.