Explain how economic profits are reduced to zero as new firms enter a monopolistically competitive industry


Influx of new sellers means that each new firm will cut into the demand of the existing firms. That is, the demand curve for each of the existing firms will fall. With entry, not only will the firm's demand curve move inward but it also becomes relatively more elastic due to each firm's products having more substitutes. This decline in demand continues to occur until the average total cost curve becomes tangent with the demand curve, and economic profits are reduced to zero.

Economics

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c. at $145
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Economics