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DIRECT: The mathematical notion that two variables change in the same direction, that is, an increase in X goes with an increase in Y, or a decrease in X goes with a decrease in Y. The alternative to a direct relation is an inverse relation, in which an increase in one variable goes with a decrease in the other. Direct relations are graphically illustrated by positively-sloped curves, a common example being the supply curve.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex hoping to buy either software that won't crash your computer or any book written by Stephan King. Be on the lookout for attractive cable television service repair people.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"Nothing great has ever been achieved except by those who dared believe that something inside them was superior to circumstances. "

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United Nations Conference on Trade and Development
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