In a constant cost industry, while the long run market supply curve is horizontal, the long run firm supply curve generally is upwards sloping.

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In a constant cost industry, the long run market supply curve is horizontal because input prices do not change as industry output changes. However, an individual firm's long run supply curve is generally upwards sloping due to increasing marginal costs as the firm expands its output.

In a Constant Cost Industry, While the Long Run Market