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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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MARGINAL COST CURVE A curve that graphically represents the relation between the marginal cost incurred by a firm in the short-run product of a good or service and the quantity of output produced. This curve is constructed to capture the relation between marginal cost and the level of output, holding other variables like technology and resource prices constant. Three related curves are average total cost curve, average variable cost curve, and average fixed cost curve.
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GREEN LOGIGUIN
[What's This?]
Today, you are likely to spend a great deal of time strolling through a department store trying to buy either a rechargeable battery for your cell phone or a T-shirt commemorating the 2000 Olympics. Be on the lookout for high interest rates.
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This isn't me! What am I?
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The average bank teller loses about $250 every year.
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"One worthwhile task carried to a successful conclusion is worth half-a-hundred half-finished tasks. " -- Malcolm S. Forbes, publisher
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EEH
Explorations in Economic History
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