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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 REVENUE PRODUCT The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a how-to book on fixing your computer, with illustrations or several magazines on computer software. Be on the lookout for crowded shopping malls.
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This isn't me! What am I?
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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"Success is the child of audacity. " -- Benjamin Disraeli, British statesman
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Y
Income, Nominal Gross National Product
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