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AGGREGATE EXPENDITURE EQUATION: An equation indicating that aggregate expenditures (AE) are the sum of consumption expenditures (C), investment expenditures (I), government purchases (G), and net exports (X-M), stated as: AE = C + I + G + (X-M). This equation surfaces in the Keynesian economic income-expenditure model in the form of the aggregate expenditures line. However, it's also central throughout the study of macroeconomics, including aggregate demand and the measurement of gross domestic product.
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ARC ELASTICITY The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.
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"When we do the best that we can, we never know what miracle is wrought in our life, or in the life of another." -- Helen Keller
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Playing The STOCK MARKETThe 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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RED AGGRESSERINE
[What's This?]
Today, you are likely to spend a great deal of time flipping through mail order catalogs seeking to buy either a how-to book on wine tasting or a bookshelf that will fit in your closet. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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This isn't me! What am I?
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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JET
Journal of Economic Theory
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