The primary reason why monopolistically competitive firms cannot make an economic profit in the long run is because

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In a monopolistically competitive market, there is freedom of entry, which means that new firms can enter the market and compete with existing firms. As more firms enter, the demand for each firm's product decreases, which reduces the firm's market power and the ability to charge higher prices. Ultimately, firms only make normal profit in the long run, as consumers have numerous substitutes to choose from, and firms cannot differentiate their product enough to establish market power. Therefore, monopolistically competitive firms cannot make an economic profit in the long run.

The Primary Reason Why Monopolistically Competitive Firms Cannot Make an Economic