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LABOR: One of the four basic categories of resources, or factors of production (the other three are capital, land, and entrepreneurship). Labor is the services and efforts of humans that are used for production. While labor is commonly thought of as those who work in factories, it includes all human efforts (except entrepreneurship), such as those provided by clerical workers, technicians, professionals, managers, and even company presidents.

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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI 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 watching infomercials seeking to buy either a package of 3 by 5 index cards, the ones without lines or a blue mechanical pencil. Be on the lookout for deranged pelicans.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
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Bureau of Agricultural Economics
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