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AGGREGATE MARKET: An economic model relating the price level and real production that is used to analyze business cycles, gross domestic product, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The aggregate market, inspired by the standard market model, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers).

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POLLUTION: Any waste that imposes an opportunity cost when it's returned to the natural environment. Pollution is one of the more prevalent examples of an externality cost and market failure. Examples include, but by no means are limited to, car exhaust, municipal sewage, industrial waste, and agricultural chemical runoff from farms. Pollution waste can be classified as degradable, persistent, or nondegradable, depending on how easily it can be broken down into nonharmful form by the natural environment. Pollution problems can never be eliminated, but they can be handled with efficiency if the amount of pollution is such that the cost of damages is the same as the cost of cleanup.

     See also | market failure | externality | environment | natural resources | materials balance | efficiency | Pigouvian tax | recycling | regulation | Coase theorem | command and control | pollution rights market |


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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time searching for a specialty store seeking to buy either a package of 4 by 6 index cards, the ones with lines or a 50 foot extension cord. Be on the lookout for strangers with large satchels of used undergarments.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"Never confuse a single defeat with a final defeat."

-- F. Scott Fitzgerald, writer

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