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9. The long-run supply curve of a perfectly competitive firm is given by a horizontal line placed at P = 3 PLN (in a graph wh

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9). When price=3 then Quantity demanded=150-5P=150-5(3)=135

Total amount of quantity produced in an industry=135

b) in long run, all firms produces at min of AC. Thus all firms produces only 5 unit

Thus number of firms=135/5=27 firms will operate

firms=27

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