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MARKET FAILURE: A condition in which a market does not efficiently allocate resources to achieve the greatest possible consumer satisfaction. The four main market failures are--(1) public good, (2) market control, (3) externality, and (4) imperfect information. In each case, a market acting without any government imposed direction, does not direct an efficient amount of our resources into the production, distribution, or consumption of the good.

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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 hoping to buy either a genuine down-filled pillow or one of those "hang in there" kitty cat posters. Be on the lookout for gnomes hiding in cypress trees.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"As the births of living creatures at first are ill-shapen, so are all innovations, which are the births of time. "

-- Sir Francis Bacon, philosopher

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