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PERFECT COMPETITION, LONG-RUN PRODUCTION ANALYSIS: 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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NUMBER OF SELLERS, SUPPLY DETERMINANT

The number of sellers willing and able to sell a good, which is assumed constant when a supply curve is constructed. The number of sellers is one of five supply determinants that shift the supply curve when they change. The other four are resource prices, production technology, other prices, and sellers' expectations.

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Today, you are likely to spend a great deal of time at a dollar discount store wanting to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for fairy dust that tastes like salt.
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In his older years, Andrew Carnegie seldom carried money because he was offended by its sight and touch.
"The only profit center is the customer."

-- Peter Drucker, educator

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