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December 16, 2025 

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PERFECT COMPETITION, REALISM: 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 one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. 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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SUBSTITUTION EFFECT

The change in quantity demanded that results because a change in the demand price of a good causes a change in the relative prices, which induces buyers to substitute the purchase of one good for another. This is one of two reasons, or effects, underlying the law of demand and the negative slope of the market demand curve. The other is the income effect.

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PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time at a garage sale trying to buy either blue cotton balls or a genuine down-filled pillow. Be on the lookout for mail order catalogs with hidden messages.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"If things are not going well with you, begin your effort at correcting the situation by carefully examining the service you are rendering, and especially the spirit in which you are rendering it."

-- Roger Babson, statistician and columnist

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Average Revenue, Autoregressive
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