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REALISM OF PERFECT COMPETITION: Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to a one or two of the four key characteristics of perfect competition, none matches all four sufficiently that we can declare a perfectly competitively industry. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a 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 firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time watching infomercials seeking to buy either a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or a rechargeable battery for your cell phone. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The first paper notes printed in the United States were in denominations of 1 cent, 5 cents, 25 cents, and 50 cents.
"You don't have to see the top of the staircase to take the first step.¾ "

-- Martin Luther King, civil rights leader

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