Answer:
The correct answer is same as the profits of a purely competitive firm.
Explanation:
A monopolistic market is characterized by a large number of sellers producing differentiated products which are close substitutes. This market has a relatively easier entry as compared to a monopoly market.
In the long-run when a monopolistic firm will be earning a positive profit. It will attract other firms to join the market. As new firms enter the market, the market supply will increase. A rightward shift in the market supply curve will cause the price level to decline. This will continue till all the profits decline to zero.
So, similar to a purely competitive firm, a monopolistic firm also earn zero economic profit in the long run.
