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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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AGGREGATE SUPPLY INCREASE, LONG-RUN AGGREGATE MARKET

A shock to the long-run aggregate market caused by an increase in aggregate supply, resulting in and illustrated by a rightward shift of the long-run aggregate supply curve. An increase in aggregate supply in the long-run aggregate market results in a decrease in the price level and an increase in real production. The level of real production resulting from the shock is a greater level of full-employment real production.

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APLS

RED AGGRESSERINE
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius wanting to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for malfunctioning pocket calculators.
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This isn't me! What am I?

Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
"A stumble may prevent a fall. "

-- Margaret Thatcher, British prime minister

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Journal of Law and Economics
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