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MARGINAL PROPENSITY TO CONSUME: The proportion of each additional dollar of household income that is used for consumption expenditures. Or alternatively, this is the change in consumption expenditures due to a change in disposable income. Abbreviated MPC, the marginal propensity to consume is the slope of the consumption or propensity-to-consume line that forms the foundation for Keynesian economics. As such, it also takes center stage for the slope of the aggregate expenditure line and the multiplier effect. The sum of the marginal propensity to consume and the related concept, the marginal propensity to save, is equal to one.

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AVERAGE FACTOR COST CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between average factor cost incurred by a perfectly competitive firm for employing an input and the quantity of input used. Because average factor cost is essentially the price of the input, the average factor cost curve is also the supply curve for the input. The average factor cost curve for a perfectly competitive firm with no market control is horizontal. The average revenue curve for a firm with market control is positively sloped.

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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 velvet painting of Elvis Presley or a wall poster commemorating yesterday. Be on the lookout for crowded shopping malls.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
"Do what you feel in your heart to be right ‚ for you'll be criticized anyway. You'll be damned if you do and damned if you don't. "

-- Eleanor Roosevelt, first lady

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