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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.
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MARGINAL PROPENSITY TO CONSUME The proportion of each additional dollar of household income that is used for consumption expenditures. The marginal propensity to consume (abbreviated MPC) is another term for the slope of the consumption line and is calculated as the change in consumption divided by the change in income. The MPC plays a central role in Keynesian economics. It quantifies the consumption-income relation and the fundamental psychological law. It is also a foundation for the slope of the aggregate expenditures line and is critical to the multiplier process. A related consumption measure is the average propensity to consume.
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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites trying to buy either a how-to book on home repairs or a large, stuffed kitty cat. Be on the lookout for poorly written technical manuals.
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John Maynard Keynes was born the same year Karl Marx died.
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"Education is the ability to listen to almost anything without losing your temper or your self-confidence. " -- Robert Frost
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