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

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In a constant cost industry, the long run firm supply curve is also upward sloping. This is because as more firms enter the market and produce more output, the cost of inputs may increase slightly, causing each firm's marginal cost curve to shift upwards. However, the long run market supply curve will still be upward sloping as more firms enter the market and produce more output.

In a Constant Cost Industry, While the Long Run Market