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DI: The abbreviation for disposable income,which is the total income that can be used by the household sector for either consumption or saving during a given period of time, usually one year. This is the income left over after income taxes and social security taxes are removed and government transfer payments, like welfare, social security benefits, or unemployment compensation are added. Because consumption and saving are important to our economy for short-run stability and long-run growth, pointy-headed economists like to keep a close eye on disposable personal income. Disposable income is reported quarterly (every three months) in the National Income and Product Accounts maintained by the Bureau of Economic Analysis.
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                           AGGREGATE DEMAND SHIFTS: Changes in the aggregate demand determinants cause the aggregate demand curve to shift. The mechanism is comparable to that for market demand determinants and market demand. There are two alternatives--an increase in aggregate demand and a decrease in aggregate demand. An increase in spending by any of the four sectors--household, business, government, and foreign--shifts the aggregate demand curve to right. A decrease in spending by these four sectors shifts the aggregate demand curve to left. | Shifting the Curve | 
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To see how this works, consider the aggregate demand curve presented in the exhibit to the right. It is a standard negatively-sloped aggregate demand curve that captures the specific one-to-one relationship between the price level and aggregate expenditures. The assorted ceteris paribus factors, that is, the aggregate demand determinants, are assumed to remain constant with the construction of the curve.Analogous to other determinants, aggregate demand determinants shift the aggregate demand curve. A change in any of the determinants can either increase or decrease the aggregate demand curve. - An increase in aggregate demand is illustrated by a rightward shift in the aggregate demand curve. Click the [Increase in AD] button for a demonstration. What does it mean to have an increase in demand? It means that for every price level, the four sectors have an increase in aggregate expenditures on real production.
- A decrease in aggregate demand is illustrated by a leftward shift. Click the [Decrease in AD] button for a demonstration. What does it mean to have a decrease in demand? It means that for every price level, the four sectors have a decrease in aggregate expenditures on real production.
Shifts of the aggregate demand curve are often the source of disequilibrium in the aggregate market. Such disequilibrium then induces changes in the price level as the economy seeks to eliminate the disequilibrium. The key is that aggregate demand determinants CAUSE shifts of the aggregate demand curve which CAUSE disequilibrium which then CAUSES changes in the price level.This suggests an important difference between two related changes--a change in aggregate demand and a change in aggregate expenditures. - A change in aggregate demand is any shift of the aggregate demand curve. With this change, the entire curve shifts to a new location. A change in aggregate demand is caused by a change in the aggregate demand determinants. This is comparable to a change in demand in the analysis of the market.
- A change in aggregate expenditures is a movement along a given aggregate demand curve. This change involves the movement from one point on the existing curve to another point on the SAME curve. The curve does not move. A change in aggregate expenditures is caused by a change in the price level, and ONLY a change in the price level! This is comparable to a change in quantity demanded in the analysis of the market.
Recommended Citation:AGGREGATE DEMAND SHIFTS, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: October 9, 2026].
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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