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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.

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FIAT MONEY

A medium of exchange (money) with value in exchange, but little or no value in use. Modern paper currency, coins, and checkable deposits are fiat money. The value of fiat money comes from the public's general willingness to accept it in exchange for other goods. This willingness comes from the fact that EVERYONE is willing to accept fiat money in exchange, which largely depends on the public's confidence in the authority (usually government) issuing the fiat money. Fiat money is NOT valuable unto itself, but it is valuable for what it can buy. In the march toward economic complexity, fiat money emerged from commodity money, money with both value in exchange and value in use.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius hoping to buy either a velvet painting of Elvis Presley or a wall poster commemorating yesterday. Be on the lookout for broken fingernail clippers.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
"The time to repair the roof is when the sun is shining."

-- John F. Kennedy, 35th U. S. president

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