If firms in a competitive market are NOT identical, then the long-run market supply curve will be

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If firms in a competitive market are not identical, then they will have different cost structures and therefore different long-run average costs. As firms enter or exit the market, the overall supply curve will shift as it depends on the costs of the marginal firm. If the firm with the highest costs leaves the market, the supply curve will shift leftward, making it upward sloping.

If Firms in a Competitive Market Are NOT Identical, Then