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NATIONAL INCOME AND PERSONAL INCOME: National income (NI) is the total income earned by the citizens of the national economy resulting from their ownership of resources used in the production during a given period of time, usually one year. Personal income (PI) is the total income received by the members of the domestic household sector, which may or may not be earned from productive activities during a given period of time. Personal income can be derived from national income by subtracting income earned but not received (IEBNR) and adding income received but not earned (IRBNE).

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OLIGOPOLY, CONCENTRATION

Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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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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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"Intense concentration hour after hour can bring out resources in people they didn't know they had. "

-- Edwin Land, inventor, entrepreneur

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Inter-American Development Bank
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