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PERFECTLY ELASTIC: An elasticity alternative in which infinitesimally small changes in price cause infinitely large changes in quantity. In other words, quantity is hyper, super, infinitely responsive to price. Any change in price, no matter how small triggers an infinite change in quantity. Perfectly elastic should be compared with other elasticity alternatives--perfectly inelastic, relatively elastic, relatively inelastic, and unit elastic.

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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 visiting every yard sale in a 30-mile radius wanting to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for jovial bank tellers.
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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.
"No task is a long one but the task on which one dare not start: It becomes a nightmare. "

-- Charles Baudelaire, poet-critic

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