Question

Which one of the following is correct?

		A.	Oligopoly firms will ALWAYS be able to make profits in both the short run and long run.
		B.	Monopoly firms can earn profits in the short run, but cannot do so in the long run.
		C.	A perfectly competitive firm can make profits in the short run, but will make zero economic profits in the long run.
		D.	Firms in monopolistically competitive markets can make positive economic profits in both the long and short run.