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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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GOLD CERTIFICATES

Paper currency issued and authorized by the U.S. Department of the Treasury that is, in principle, backed up by, and exchangeable for, an equivalent value of gold. Gold certificates were in circulation as a medium of exchange for the U.S. economy during two periods, 1865 to 1922 and 1928 to 1934. A similar form of paper currency is silver certificates.

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Today, you are likely to spend a great deal of time at the confiscated property police auction trying to buy either clothing for your pet iguana or a set of hubcaps. Be on the lookout for mail order catalogs with hidden messages.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
"It is the mark of an educated mind to be able to entertain a thought without accepting it."

-- Aristotle

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