Why can a monopoly sustain economic profits over an extended period?

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Because there are obstacles preventing new firms from entering the marketBecause potential rivals occasionally fail to detect the profitsBecause the monopolist has significant financial resourcesBecause antitrust regulations remove competitors for a limited timeDue to all the factors mentioned in the other options

Explanation

A monopoly can maintain long-term economic profits primarily because barriers to entry prevent other firms from entering the market. Other factors, such as rivals overlooking profits, the monopolist's financial strength, or antitrust laws, do not guarantee sustained profits on their own.