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SIGNALLING: The use of low-cost, easy to obtain information about a product or commodity to indicate the quality of a product. Signalling occurs when buyers use features of a commodity or actions by the seller to indicate overall product quality. These signals can be either intended or unintended.

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VARIABLE INPUT

An input whose quantity can be changed in the time period under consideration. The most common example of a variable input is labor. Variable inputs provide the means used by a firm to control short-run production. The alternative to variable input is fixed input. 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, which is the law of diminishing marginal returns.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a birthday greeting card for your uncle or a T-shirt commemorating the 2000 Presidential election. Be on the lookout for poorly written technical manuals.
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A half gallon milk jug holds about $50 in pennies.
"In a decisive set, confidence is the difference. "

-- Chris Evert, tennis champion

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