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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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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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APLS

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a really, really exciting, action-filled video game or a coffee cup commemorating the moon landing. Be on the lookout for strangers with large satchels of used undergarments.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Nothing so conclusively proves a man's ability to lead others as what he does from day to day to lead himself."

-- Thomas J. Watson, IBM founder

WLS
Weighted Least Squares
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