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VARIABLE INPUT: An input whose quantity can be changed in the time period under consideration. This should be immediately compared and contrasted with fixed input. The most common example of a variable input is labor. A variable input provides the extra inputs that a firm needs to expand short-run production. In contrast, a fixed input, like capital, provides the capacity constraint in production. As larger quantities of a variable input, like labor, are added to a fixed input like capital, the variable input becomes less productive. This is, by the way, the law of diminishing marginal returns.

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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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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for rusty deck screws.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"Lead the life that will make you kindly and friendly to everyone about you, and you will be surprised what a happy life you will lead."

-- Charles M. Schwab

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