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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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CROSS ELASTICITY OF DEMAND

The relative response of a change in the demand for one good to a change in the price of another good. More specifically the cross elasticity of demand is percentage change in the demand for one good due to a percentage change in the price of another good. This notion of elasticity captures the other prices demand determinant. Three other notable elasticities are the price elasticity of demand, the price elasticity of supply, and the income elasticity of demand.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either a wall poster commemorating next Thursday or a pair of gray heavy duty boot socks. Be on the lookout for gnomes hiding in cypress trees.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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