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CHANGE IN AGGREGATE DEMAND: A shift of the aggregate demand curve caused by a change in one of the aggregate demand determinants. In essence, a change in aggregate demand is caused by any factor affecting aggregate demand EXCEPT the price level. This concept should be contrasted directly with a change in aggregate expenditures. You might also want to review the terms change in quantity demanded and change in demand, as well. The change in aggregate demand is comparable to the change in market demand. A change in aggregate demand is a change in ALL price level-aggregate expenditure combinations, meaning that each price level is matched up with a different aggregate expenditure (which is illustrated as a shift of the aggregate demand curve). This change in aggregate demand is caused by a change in any of the aggregate demand determinants. In contrast, a change in aggregate expenditures is a change from one price level-aggregate expenditure combination to the another (which is illustrated as a movement along a given aggregate demand curve).

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KEYNESIAN CROSS:

A diagram illustrating the basic Keynesian theory of macroeconomics, with aggregate expenditures measured on the vertical axis and aggregate production measured on the horizontal axis, with the relation between aggregate expenditures and aggregate production represented by a positively-sloped aggregate expenditures line. The "cross" aspect of this diagram is the intersection between the aggregate expenditures line and a 45-degree line indicating every point of equality between aggregate expenditures and aggregate production. The "Keynesian" aspect of this diagram is derived from John Maynard Keynes, the developer and namesake of Keynesian economics.
Keynesian cross is a somewhat dated and seldom used reference to the standard Keynesian economics diagram relating aggregate expenditures and aggregate production. This diagram is also commonly referred to as the Keynesian model, the aggregate expenditures model, or the income-expenditures model. The term, Keynesian cross, pays tribute to John Maynard Keynes, the economist responsible for developing this macroeconomic theory in the 1930s. It also provides contrast with another fundamental economic diagram, the Marshallian cross, which is another term for the standard market model diagram.

Keynesian Cross
Keynesian Cross
This exhibit illustrates the basic Keynesian cross diagram. The vertical axis measures aggregate expenditures. The horizontal axis measures aggregate production. The red positively-sloped line, AE, represents the relation between aggregate expenditures and aggregate production. The slope of the AE line is positive, but less than one. The black positively-sloped line, Y=AE, is an equilibrium guide line that indicates all points in the diagram in which aggregate production is equal to aggregate expenditures. The slope of this Y=AE line is positive and equal to one. It is also termed a 45-degree line because it exactly bisects the 90-degree angle formed by the vertical and horizontal axes, creating a 45-degree angle with either axis.

The AE line is the combined expenditures of the four macroeconomic sectors--consumption expenditures, investment expenditures, government purchases, and net exports. The slope of the AE line is primarily attributable to the slope of the consumption function, which is the marginal propensity to consume. The slope, however, is modified somewhat by induced investment, induced government purchases, and induced imports. Even with this adjustments, the slope is still positive and less than one.

The intersection of the AE line and the 45-degree at $12 trillion in this exhibit is the Keynesian equilibrium. This is the value of aggregate production in which aggregate expenditures are exactly equal to aggregate production. Given the existing AE line, no other level of aggregate production achieves equilibrium equality between expenditures and production. Should the AE line shift up or down, then a new level of aggregate production achieves equilibrium.

An important, but not readily apparent, implication of the Keynesian cross is that equilibrium does not necessarily correspond to the full employment of resources. In this exhibit, $12 trillion of aggregate production may or may not achieve full employment. More to the point of Keynesian economics, there is no reason to think that this equilibrium level of aggregate production NECESSARILY achieves full employment.

<= KEYNESIAN AGGREGATE SUPPLY CURVEKEYNESIAN DISEQUILIBRIUM =>


Recommended Citation:

KEYNESIAN CROSS, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2024. [Accessed: March 3, 2024].


Check Out These Related Terms...

     | Keynesian economics | aggregate expenditures | aggregate production | consumption function | marginal propensity to consume | induce expenditures | aggregate expenditures line | 45-degree line | Keynesian model | Keynesian equilibrium |


Or For A Little Background...

     | model | graphical analysis | variables | economic analysis | economic thinking | macroeconomics |


And For Further Study...

     | Marshallian cross | multiplier | classical economics | psychological law | autonomous expenditures | derivation, aggregate expenditures line | injections-leakages model | fiscal policy | paradox of thrift |


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