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NATURAL UNEMPLOYMENT: The combination of frictional and structural unemployment that persists in an efficient, expanding economy when labor and resource markets are in equilibrium. Natural unemployment exists when the economy is at full employment, which for practical purposes is defined as the condition in which the quantity of resources demanded is equal to the quantity of resources supplied. Most important for policy purposes, natural employment exists with stable prices, that is, no inflation.

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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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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Believe one who has tried it. "

-- Virgil, Roman poet

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