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January 18, 2026 

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U-SHAPED COST CURVES: The family of short-run cost curves consisting of average total cost, average variable cost, and marginal cost, all of which have U-shapes. They are U-shaped because each has high but falling cost at low quantities of output, which then reaches a minimum, then has rising cost at larger quantities of output. Although the average fixed cost curve is not U-shaped, it's occasionally included with the other three just for sake of completeness.

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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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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either software that won't crash your computer or any book written by Stephan King. Be on the lookout for small children selling products door-to-door.
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This isn't me! What am I?

Sixty percent of big-firm executives said the cover letter is as important or more important than the resume itself when you're looking for a new job
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."

-- Mark Twain

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Autoregressive Conditional Heteroskedasticity
A PEDestrian's Guide
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