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HERFINDAHL 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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ELASTIC

The general relation between two variables in which relatively small changes in one variable (A) cause relatively large changes in another variable (B). Small changes in variable A cause relatively large changes in variable B or the percentage change in variable B is larger than the percentage change in variable A. This characterization of elasticity is most important for the price elasticity of demand and the price elasticity of supply. Elastic is one of two general elasticity relations between two variables. The other is inelastic.

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Today, you are likely to spend a great deal of time wandering around the shopping mall looking to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for malfunctioning pocket calculators.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"Intense concentration hour after hour can bring out resources in people they didn't know they had. "

-- Edwin Land, inventor, entrepreneur

ARIMA
Autoregressive Integrated Moving Average
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