Concept:A firm that can charge the maximum price without attracting new entrants must have strong barriers to entry.
Only a monopolistic firm can do this because it controls supply and blocks potential competitors.
Explanation:A monopolistic firm is the sole producer of a good or service in a market.
It has high barriers to entry, such as patents, exclusive ownership of resources, or legal restrictions.
These barriers prevent new firms from entering, so the monopolist can set a high price without losing customers to competitors.
In the long run, it continues to earn abnormal profit because no rival can challenge its market power.
On the other hand, a monopolistically competitive firm faces many rivals and low entry barriers.
If it charged the maximum price, high profits would attract new entrants and reduce its market share.
Similarly, a perfectly competitive firm cannot set prices above the market equilibrium because it is a price taker.
Therefore, the only firm that can safely charge the maximum price is one with monopoly power.
Answer:C. Monopolistic firm