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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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SCREENING

When confronted by asymmetric information, the use of small bits of information, or indicators, that suggest more comprehensive information. Screening occurs when those with limited information try to identify indicators suggesting more complete information. It is used in markets with adverse selection and moral hazard, especially in labor markets and in the provision of insurance. Common methods of screening include aptitude tests, affiliations, past behavior, and personal characteristics. A related method is signalling.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store wanting to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for rusty deck screws.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"We succeed only as we identify in life, or in war, or in anything else, a single overriding objective, and make all other considerations bend to that one objective. "

-- President Dwight D. Eisenhower

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