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VOLUNTARY EXCHANGE: The process of willingly trading one item for another. The emphasis here is on "willingly." Voluntary exchanges are the heart and soul of market transactions, and should be contrasted with the "involuntary" exchanges mandated by government taxes, laws, and regulations. While involuntary government-forced exchanges play an important role in a mixed economy, economists really, really like voluntary market exchanges because they promote economic efficiency.

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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 browsing through a long list of dot com websites wanting to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for cardboard boxes.
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Woodrow Wilson's portrait adorned the $100,000 bill that was removed from circulation in 1929. Woodrow Wilson was removed from circulation in 1924.
"Most human beings have an almost infinite capacity for taking things for granted. "

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A nth-order Moving Average Process
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