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ENDOGENOUS VARIABLE: A variable that is identified within the workings of the model. Also termed a dependent variable, an endogenous variable is in essence the "output" of the model. It should be compared with an exogenous variable this is the "input" of the model.
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FOUR-FIRM CONCENTRATION RATIO The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
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"Plans are only good intentions unless they immediately degenerate into hard work." -- Peter Drucker, management consultant
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Income
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