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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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CONSTANT-COST INDUSTRY

A perfectly competitive industry with a horizontal long-run industry supply curve that results because expansion of the industry causes no change in production cost or resource prices. A constant-cost industry occurs because the entry of new firms, prompted by an increase in demand, does not affect the long-run average cost curve of individual firms, which means the minimum efficient scale of production does not change.

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APLS

GRAY SKITTERY
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius hoping to buy either a how-to book on surfing the Internet or a computer that can play music and burn CDs. Be on the lookout for telephone calls from long-lost relatives.
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Rosemary, long associated with remembrance, was worn as wreaths by students in ancient Greece during exams.
"Defeat is simply a signal to press onward. "

-- Helen Keller, author, lecturer

GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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