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LOCAL INPUT: An input that has a relatively small geographic market area due to the high cost of transportation. The high transportation cost means it is easier (that is, less expensive) to locate the production activity near the input rather than trying to bring the input to the production activity. Like many things, local inputs are a matter of degree. At the other end of the spectrum lies transferrable inputs. Natural resources of the land, such as soil fertility, weather conditions, mineral deposits, tend to have the greatest local orientation. Labor and many urban public utilities, such as water distribution and sewage disposable, also tend to fall into the local category.

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MARGINAL PROPENSITY TO INVEST: The proportion of each additional dollar of national income that is used for investment expenditures. Or alternatively, this is the change in investment expenditures due to a change in national income. Abbreviated MPI, the marginal propensity to invest is the slope of the investment line used in the analysis of Keynesian economics. As such, it also plays a role in the slope of the aggregate expenditure line and the multiplier effect.

     See also | investment expenditures | national income | investment line | Keynesian economics | multiplier | aggregate expenditures line | marginal propensity to consume | marginal propensity to save | marginal propensity to import | marginal propensity for government purchases |


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MARGINAL PROPENSITY TO INVEST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: May 19, 2025].


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PERFECT COMPETITION, REALISM

Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.

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Today, you are likely to spend a great deal of time searching for rummage sales looking to buy either high-gloss photo paper that works with your printer or a desktop calendar with all federal and state holidays highlighted. Be on the lookout for strangers with large satchels of used undergarments.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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