Consider an industry where there is perfect competition (with the conventional horizontal long-run market supply curve). Initially, all of the firms are making zero economic profit, then, the price of an important input falls so that firms all make positive economic profit in the short run, but in the long run economic profit returns to zero. Draw this using a two-panel diagram. Draw the representative firm panel on the left-hand-side and the market panel on the right-hand-side. Your diagram must be carefully drawn and properly labelled. Explain why, referring to your diagrams, in the long run profit returns to zero. ( maximum word limit: 150 words)

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