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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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EXPANSION

A phase of the business cycle characterized by a general period of rising economic activity. An expansion is one of two basic business cycle phases. The other is contraction. The transition from expansion to contraction is termed a peak and the transition from contraction to expansion is termed a trough. The early phase of an expansion is commonly termed a recovery.

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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time flipping through the yellow pages seeking to buy either a wall poster commemorating next Thursday or a pair of gray heavy duty boot socks. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"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

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Statistical Product and Service Solutions, Statistical Package for the Social Sciences (software)
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