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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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DEMAND

The willingness and ability to buy a range of quantities of a good at a range of prices, during a given time period. Demand is an inverse relation between price (demand price) and quantity (quantity demanded). Demand is one half of the market exchange process--the other is supply. This demand side of the market draws inspiration from the unlimited wants and needs dimension of the scarcity problem.

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Today, you are likely to spend a great deal of time lost in your local discount super center wanting to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for the last item on a shelf.
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Two and a half gallons of oil are needed to produce one automobile tire.
"The true idealist pursues what his heart says is right in a way that his head says will work. "

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