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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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UNDERGROUND ECONOMY

Illegal and unreported market transactions and productive activity that escape the watchful eyes of official record keepers. By most estimates, a substantial amount of productive activity takes place in the underground economy of the United States. Of course, these are only estimates because such activity, by definition, goes unreported. If activity in the underground economy is added to official activity in the "overground" economy, then gross domestic product could be boosted by as much as 25 percent to 50 percent, or more. Inclusion of employment in the underground economy is also likely reduce the official unemployment rate by a few percentage points.

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Today, you are likely to spend a great deal of time browsing about a thrift store hoping to buy either a country wreathe or galvanized steel storage shelves. Be on the lookout for letters from the Internal Revenue Service.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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