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PPF: The abbreviation for production possibilities frontier, which is a curve that illustrates the production possibilities for the economy. A production possibilities frontier represents the boundary or frontier of the economy's production capabilities. That's why it's termed a production possibilities frontier (or PPF). As a frontier, it is the maximum production possible given existing (fixed) resources and technology. Producing on the curve means resources are fully employed, while producing inside the curve means resources are unemployed. The law of increasing opportunity cost is what gives the curve its distinctive convex shape.

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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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Today, you are likely to spend a great deal of time at a garage sale trying to buy either a how-to book on home decorating or a set of luggage with wheels. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
"Progress always involves risk. You can't steal second base and keep your foot on first. "

-- Frederick B. Wilcox

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