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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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AGGREGATE DEMAND AND MARKET DEMAND

The aggregate demand curve, or AD curve, has similarities to, but differences from, the standard market demand curve. Both are negatively sloped. Both relate price and quantity. However, the market demand curve is negatively sloped because of the income and substitution effects and the aggregate demand curve is negatively sloped because of the real-balance, interest-rate, and net-export effects.

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APLS

YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a package of blank rewritable CDs or yellow cotton balls. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"We tend to forget that happiness doesn't come as a result of getting something we don't have, but rather of recognizing and appreciating what we do have."

-- Fredrick Koeing

PIH
Permanent Income Hypothesis
A PEDestrian's Guide
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