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INCREASING OPPORTUNITY COST: The proposition that opportunity cost, the value of foregone production, increases as more of a good is produced. This 'law' is most important to the slope of the production possibilities curve. It generates the convex shape of the curve, making the curve flat at the top and steep at the bottom.

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INVESTMENT LINE

A graphical depiction of the relation between investment expenditures by the business sector and the economy's aggregate level of income or production. This relation plays a key role in the study of Keynesian economics. A investment line is characterized by vertical intercept, which indicates autonomous investment, and slope, which is the marginal propensity to invest and indicates induced investment. The aggregate expenditures line used in Keynesian economics is derived by adding or stacking the investment line onto the consumption line, then adding government purchases and net exports to this stack.

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GRAY SKITTERY
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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either a revolving spice rack or a how-to book on home repairs. Be on the lookout for door-to-door salesmen.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Time is the scarcest resource, and unless it is managed nothing else can be managed."

-- Peter F. Drucker

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Options Clearing Corporation
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