The market supply curve for a perfectly competitive,constant cost industry is

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In a perfectly competitive, constant cost industry, all firms face the same cost curves. Therefore, the market supply curve is determined by horizontally summing the individual firms' marginal cost curves above the minimum average variable cost. This is because in the long run, firms can enter or exit the industry, which ensures that no firm can earn positive economic profits in the long run. Thus, the market supply curve will be perfectly elastic in the long run.

The Market Supply Curve for a Perfectly Competitive,constant Cost Industry