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AGGREGATE EXPENDITURES LINE: A line representing the relation between aggregate expenditures and gross domestic product used in the Keynesian cross. The aggregate expenditure line is obtained by adding investment expenditures, government purchases, and net exports to the consumption line. As such, the slope of the aggregate expenditure line is largely based on the slope of the consumption line (which is the marginal propensity to consume), with adjustments coming from the marginal propensity to invest, the marginal propensity for government purchases, and the marginal propensity to import. The intersection of the aggregate expenditures line and the 45-degree line identifies the equilibrium level of output in the Keynesian cross.

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PRICE DISCRIMINATION

The act of selling the same good to different buyers for different prices that are not justified by different production costs. This is practiced by suppliers who have achieved some degree of market control, especially monopoly. Common examples of price discrimination are electricity rates, long-distance telephone charges, movie ticket prices, airplane ticket prices, and assorted child or senior citizen discounts. Price discrimination takes the form of one of three degrees: (1) first degree, in which each price is the maximum price that buyers are willing and able to pay, (2) second degree, in which price is based on the quantity sold, and (3) third degree, in which prices are based on an easily identifiable characteristic of the buyer.

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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either a set of serrated steak knives, with durable plastic handles or a pair of blue silicon oven mitts. Be on the lookout for rusty deck screws.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
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