19. Pure monopolists may obtain economic profits in the long run because: a. of advertising. b. marginal revenue is constant as sales increase. c. of barriers to entry. d. of rising average fixed costs.

19. Pure monopolists may obtain economic profits in the long run because:
a. of advertising.
b. marginal revenue is constant as sales increase.
c. of barriers to entry.
d. of rising average fixed costs.

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