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December 22, 2025 

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LRAC: The abbreviation for long-run average cost, which is the per unit cost of producing a good or service in the long run when all inputs are variable. In other words, long-run total cost divided by the quantity of output produced. Long-run average cost is based on economies of scale (or increasing returns to scale) and diseconomies of scale (or decreasing returns to scale).

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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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APLS

PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time searching the newspaper want ads trying to buy either a flower arrangement with anything but tulips for your grandfather or a birthday greeting card for your mother that doesn't look like a greeting card. Be on the lookout for slow moving vehicles with darkened windows.
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This isn't me! What am I?

Al Capone's business card said he was a used furniture dealer.
"I feel sorry for the person who canžt get genuinely excited about his work. Not only will he never be satisfied, but he will never achieve anything worthwhile. "

-- Walter Chrysler, automaker

NBER
National Bureau of Economic Research
A PEDestrian's Guide
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