Because monopolistically competitive firms cannot earn long-run economic profits,they do not have any degree of monopoly power.

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Monopolistically competitive firms do have some degree of monopoly power, but it is limited. They are able to differentiate their products and charge a slightly higher price than their competitors, but they face competition from close substitutes, which limits their ability to set prices. However, in the long run, the entry of new firms into the market can erode any economic profits, leading to a lack of long-run economic profits.

Because Monopolistically Competitive Firms Cannot Earn Long-Run Economic Profits,they Do