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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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DERIVATION, CONSUMPTION LINE

A consumption line, a graphical depiction of the relation between household sector consumption and income, can be derived from a simple consumption schedule, a table or chart showing the relation between household sector consumption and income. This is easily accomplished by plotting the consumption-income pairs from the schedule as points in a diagram that measures consumption on the vertical axis and income on the horizontal axis, then connection the points with a line. The consumption line can also be derived directly by plotting the consumption function using slope and intercept values.

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RED AGGRESSERINE
[What's This?]

Today, you are likely to spend a great deal of time surfing the Internet hoping to buy either a green and yellow striped sweater vest or a Boston Red Sox baseball cap. Be on the lookout for celebrities who speak directly to you through your television.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"He who truly knows has no occasion to shout. "

-- Leonardo da Vinci, painter, sculptor, architect, engineer

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