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MARKET SHOCK: A disruption of market equilibrium (that is, a market adjustment) caused by a change in a demand determinant (and a shift of the demand curve) or a change in a supply determinant (and a shift of the supply curve). A market shock can take one of four forms--an demand increase, demand decrease, supply increase, or supply decrease. An increase is seen as a rightward shift of either curve and results in an increase in equilibrium quantity. A decrease is a leftward shift of either curve and results in a decrease in equilibrium quantity. However, a change in demand results in price and quantity to change in the same direction, while a change in supply causes equilibrium price to move the opposite direction as quantity.
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                           AGGREGATE DEMAND AND MARKET DEMAND: The aggregate demand curve, or AD curve, has similarities to, but differences from, the standard market demand curve. Both are negatively sloped. Both relate price and quantity. However, the market demand curve is negatively sloped because of the income and substitution effects and the aggregate demand curve is negatively sloped because of the real-balance, interest-rate, and net-export effects. | Two Similar Curves | 
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To illustrate the specific aggregate demand and market demand curve similarities and differences consider the graph of a negatively sloped curve displayed here. Is this a market demand curve or an aggregate demand curve? A cursory look suggests that it could be either.To reveal the similarities between the both curves, click the [Market Demand] and [Aggregate Demand] buttons. Doing so illustrates that both curves are negatively sloped, with each virtually overlaying the other. Consider the differences between these two curves. - First, note that for the market demand curve, the vertical axis measures demand price and the horizontal axis measures quantity demanded. For aggregate demand curve, however, the vertical axis measures the price level (GDP price deflator) and the horizontal axis measures real production (real GDP).
- Second, the negative slope of the market curve reflects the law of demand and is attributable to the income effect and the substitution effect. In contrast, the negative slope of the aggregate demand curve is based the real-balance effect, interest-rate effect, and net-export effect. Similar, but different.
Most notable, the differences between market demand and aggregate demand mean that it is not possible to merely add up, or aggregate, the market demand curves for the thousands of goods produced in the economy to derive the aggregate demand curve. The aggregate demand curve dances to its own music and plays be its own set of rules.
Recommended Citation:AGGREGATE DEMAND AND MARKET DEMAND, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2015. [Accessed: January 28, 2015].
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State of the ECONOMY
U.S. National Debt
January 20, 2015
$18,090,470,559,563.95
$56,560.07 per person: U.S. Debt Clock
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Lombard Street is London's equivalent of New York's Wall Street.
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"Even a mistake may turn out to be the one thing necessary to a worthwhile achievement." -- Henry Ford
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NASD
National Association of Securities Dealers
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