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FIXED INPUT: An input in the production of goods and services that does not change in the short run. A fixed input should be compared with a variable input, an input that DOES change in the short run. Fixed and variable inputs are most important for the analysis of short-run production by a firm. The best example of a fixed input is the factory, building, equipment, or other capital used in production. The comparable example of a variable input would then be the labor or workers who work in the factory or operate the equipment. In the short run (such as a day or so) a firm can vary the quantity of labor, but the quantity of capital is fixed.

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Lesson 9: Macro Basics | Unit 5: Issues Page: 15 of 16

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Using the scientific method to test macroeconomic theories is an evolving process. Over time, more hypotheses are tested and macroeconomic theories grow, expand and improve.
  • Hypotheses from macroeconomic theories are not easily subject to experimental testing. Economists can't control the economy but must wait for it to cooperate.
  • The result of combining different political philosophies and vested interests with the inability to provide definitive explanations, creates alternative, competing theories that seek to explain the world.

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MARGINAL PRODUCT CURVE

A curve that graphically illustrates the relation between marginal product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the incremental change in output at each level of a variable input. The marginal product curve is one of three related curves used in the analysis of the short-run production of a firm. The other two are total product curve and average product curve. The marginal product curve plays in key role in the economic analysis of short-run production by a firm.

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Today, you are likely to spend a great deal of time searching for a specialty store wanting to buy either a set of tires or a birthday gift for your grandfather. Be on the lookout for strangers with large satchels of used undergarments.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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