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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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ABSTRACTION

Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is an essential feature of the scientific method. Hypothesis verification, model construction, and comparative static analysis are not possible without abstraction.

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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a T-shirt commemorating yesterday or a pair of handcrafted oven mitts. Be on the lookout for fairy dust that tastes like salt.
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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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