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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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SCARCE RESOURCES

Labor, capital, land, and entrepreneurship used by society to produce consumer satisfying goods and services. Scarce resources, also termed just resources, are often given the more descriptive term factors of production.

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Today, you are likely to spend a great deal of time strolling through a department store trying to buy either a microwave over that won't burn your popcorn or a T-shirt commemorating the first day of winter. Be on the lookout for small children selling products door-to-door.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"The only profit center is the customer."

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