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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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FOUR-SECTOR AGGREGATE EXPENDITURES LINE

A graphical depiction of the relation between aggregate expenditures by the four macroeconomic sectors (household, business, government, and foreign) and the level of aggregate income or production. The four-sector aggregate expenditures line combines consumption expenditures, investment expenditures, government purchases, and net exports. The slope of this aggregate expenditures line is based on the marginal propensity to consume, adjusted for marginal propensities of the other expenditures that are assumed to be induced when constructing the line. This is one of three aggregate expenditures lines based on the number of sectors included. The others are the two-sector aggregate expenditures line and the three-sector aggregate expenditures line.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store seeking to buy either a birthday greeting card for your uncle or a T-shirt commemorating the 2000 Presidential election. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"There are two big forces at work, external and internal. We have very little control over external forces such as tornadoes, earthquakes, floods, disasters, illness and pain."

-- Leo Buscaglia, Author

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