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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-- Alexander Graham Bell, inventor

The hazards of being a pedestrian are many. Of course we have a good chance of crossing paths with a rabid bengal tiger that has highjacked a street cleaner and intends to whitewash every pair of jogging shoes encountered. Or a throng of overzealous religious fanatics might try to slip fresh flowers into our hands and literature into our pockets. And especially when we amble through the financial district, we might be crushed by falling stock market investors who have mistakenly BOUGHT HIGH and SOLD LOW. While the actions of the bengal tiger and overzealous religious fanatics might be understandable, what's so almighty important about the stock market that would make investors place the well-being of innocent pedestrians in jeopardy?
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers wanting to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for fairy dust that tastes like salt.
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