Why doesn't the abnormal profit of a monopolist, unlike that of the perfect competitor, reduce to zero in the long run?
The main reason why the perfectly competitive industry profit decreases overtime is free entry and exit of the firm in the market. Under a perfect market condition if the firm is earning a supernormal profit it will attract more and more other firms in the market. This will increase the output and decrease the price reducing the profit.
But, in a monopoly, there are barriers to entry and no firm can enter the market. This ensures the monopoly firm maintains a profit even in the long-run.
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