In perfect competition, one result of the model was that there were no economic profits in the long run.In a monopoly, the firm typically earns a positive economic profit.Why is there this difference?

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The Answer of In perfect competition, one result of the model was that there were no economic profits in the long run.In a monopoly, the firm typically earns a positive economic profit.Why is there this difference?

In Perfect Competition, One Result of the Model Was That