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SAY'S LAW: A classical economic proposition stating that the production of aggregate output creates sufficient aggregate demand to purchase all of the output produced. In other words, supply creates its own demand. This is one of the three assumptions underlying the macroeconomic theory of classical economics which concluded that unrestricted market activity would generate full employment. The other two assumptions are flexible prices and saving-investment equality. Say's law is closely associated with the circular flow model.

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EIGHT-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the eight 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 eight-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 eight largest firms in the industry.

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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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