In the long run, a perfectly competitive firm adjusts plant size, or the quantity of capital, to maximize long-run profit. In addition, the entry and exit of firms into and out of a perfectly competitive market guarantees that each perfectly competitive firm earns nothing more or less than a normal profit. As a perfectly competitive industry reacts to changes in demand, it traces out positive, negative, or horizontal long-run supply curve due to increasing, decreasing, or constant cost.

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The time has come to take a firm stand! The Shady Valley Gazette Tribune-Journal has published an inflammatory editorial calling for a "pedestrian" tax on anyone who ambles around the economy. This tax, as every pedestrian would surely agree, is misguided and short-sighted. It's also unfair and probably unconstitutional. How DARE the editors of the Shady Valley Gazette Tribune-Journal call for a "pedestrian" tax. Sure they argue that ambling pedestrians should help pay for the sidewalks, traffic signals, and other assorted public goods. But, it's certainly not in MY best interest as a pedestrian to pay this misguided, short-sighted, unfair, and probably unconstitutional tax.
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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

-- Charles F. Kettering

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