15. A purely competitive firm: a. must earn a normal profit in the short run. b. cannot earn economic profit in the long run. c. may realize either economic profit or losses in the long run. d. cannot earn economic profit in the short run.

15. A purely competitive firm:
a. must earn a normal profit in the short run.
b. cannot earn economic profit in the long run.
c. may realize either economic profit or losses in the long run.
d. cannot earn economic profit in the short run.

find the cost of your paper