In the long- run equilibrium, a firm's price definitely equals its average total cost in

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In the long-run equilibrium of monopolistic competition, firms face a tangency situation where price equals average total cost due to the entry and exit of firms, ensuring zero economic profit. In contrast, monopolies can sustain long-term economic profits due to barriers to entry, allowing them to set prices above average total costs.

In the Long- Run Equilibrium, a Firm's Price Definitely Equals