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EXCESS DEMAND: A disequilibrium condition in a competitive market in which the quantity demanded is greater than the quantity supplied, hence there's "extra" demand. Pointy-headed economists generally use the more technical term shortage rather than excess demand. The reason, of course, is that shortage has two syllables and excess demand has four. The time saved in pronouncing two syllables rather than four is a definite efficiency plus for the entire economy.

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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 at a dollar discount store trying to buy either a birthday greeting card for your grandfather or a weathervane with a cow on top. Be on the lookout for the last item on a shelf.
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In the early 1900s around 300 automobile companies operated in the United States.
"My philosophy of life is that if we make up our mind what we are going to make of our lives, then work hard toward that goal, we never lose - somehow we win out."

-- President Ronald Reagan

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