March 21, 2018 

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PHYSICAL WEALTH, AGGREGATE EXPENDITURES DETERMINANT: One of several specific aggregate expenditures determinants assumed constant when the aggregate expenditures line is constructed, and that shifts the aggregate expenditures line when it changes. A decrease in physical wealth causes an increase (upward shift) of the aggregate expenditures line. An increase in physical wealth causes a decrease (downward shift) of the aggregate expenditures line. Other notable aggregate expenditures determinants include consumer confidence, federal deficit, inflationary expectations, and exchange rates.

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COMPARATIVE STATICS: The technique of comparing the equilibrium resulting from a change in a determinant with the equilibrium prior to the change. Comparative statics is the primary analytical technique used in the study of economics. A popular example of this technique is found in the study of markets. Comparative statics is used to analyze how the equilibrium price and equilibrium quantity are affected by changes in the demand and supply determinants, which are graphically represented by shifts of the respective demand or supply curves.

     See also | equilibrium | ceteris paribus | economic analysis | determinant | market | aggregate market | equilibrium price | equilibrium quantity | demand shock | supply shock | surplus | shortage |

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A graphical representation of the relation between the level of aggregate production and one or more injections. The three injections (non-consumption expenditures on aggregate production) are investment expenditures, government purchases and exports. The injections line sequentially adds, or layers, each of these three expenditures depending on the number of sectors used in the analysis (two, three, or four). The slope of the injections line depends on which if any of the expenditures are induced by aggregate production. The injections line is combined with the leakages line (containing saving, taxes, and imports) in the Keynesian injections-leakages model.

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