Answer:
The monopolist is in the long run.
Explanation:
The monopolist is in the long run because, in the long run, a monopolist earns or gets zero economic profit. In the short run, it earns supernormal profit that attracts the new firms into the market and this entry continues until the economic profit becomes zero and in the long run, its price is equal to the average total cost. Moreover, the average total cost curve becomes tangent to the demand curve in the long run.
