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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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CIRCULAR FLOW A model of the continuous movement of production, income, and the services of scarce resources that flow between producers and consumers. In particular, the circular flow is a model of the continuous production and consumption interaction among the four major sectors of the macroeconomy--household, business, government, and foreign--using the three macroeconomic markets--product, resource, and financial. The circular flow model provides a easy way of getting the "big picture" and of seeing how the key parts of the macroeconomy fit together.
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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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"Don't be afraid if things seem difficult in the beginning. That's only the initial impression. The important thing is not to retreat; you have to master yourself." -- Olga Korbut, Gymnast
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CHIPS
Clearinghouse Interbank Payments System
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