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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is 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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LAW

A generally accepted, verified, proven, fundamental scientific relation. A law is a scientifically certified, thoroughly verified, cause-and-effect relation about the workings of the world. It has been tested and retested through the scientific method. The law of demand, law of increasing opportunity cost, and law of diminishing marginal utility are three fundamental (and extremely important) economic laws of nature.

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GRAY SKITTERY
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Today, you are likely to spend a great deal of time searching for rummage sales seeking to buy either a video camera with stop action features or one of those memory foam pillows. Be on the lookout for mail order catalogs with hidden messages.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"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

AR(N)
A nth-order Autoregressive Process
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