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FIXED FACTOR OF PRODUCTION: An input whose quantity cannot be changed in the time period under consideration. This usually goes by the shorter term fixed input and should be immediately compared and contrasted with variable factor of production, which goes by the shorter term variable input. The most common example of a fixed factor of production is capital. A fixed factor of production provides the "capacity" constraint for the short-run production of a firm. As larger quantities of a variable factor of production, like labor, are added to a fixed factor of production like capital, the variable input becomes less productive. This is, by the way, the law of diminishing marginal returns. For more detailed discussion, take a look at the shorter, more commonly used alias of fixed factor of production, which is fixed input.

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MARGINAL PROPENSITY TO IMPORT

The change in imports purchased from the foreign induced by a change in income or production (national income or gross domestic product). The marginal propensity to import (abbreviated MPM) is another term for the slope of the imports line and is calculated as the change in imports divided by the change in income or production. The MPM plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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