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KEYNESIAN CROSS: The standard diagram used in Keynesian economics to identify the equilibrium level of aggregate output (that is, gross domestic product), with aggregate expenditures measured on the vertical axis, and aggregate output measured on the horizontal axis. This diagram contains two key lines, the aggregate expenditure line and the 45-degree line. Intersection between these lines indicates equilibrium aggregate output. This intersection, or cross, is what gives rise to the name.
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                           SUBSTITUTE-IN-CONSUMPTION: One of two (or more) goods that provide the same basic satisfaction of a want or need when consumed. A substitute-in-consumption is one of two alternatives falling within the other prices determinant of demand. The other is a complement-in-consumption. An increase in the price of one substitute good causes an increase in demand for the other. A substitute-in-consumption has a positive cross elasticity of demand. Substitutes-in-consumption are two or more goods that satisfy the same wants or needs. Consuming one good means that buyers have no need to consume another. Buy one or buy the other, but not both.The need for food can be satisfied by consuming pizza or fried chicken. The need for transportation can be satisfied by buying a sport utility vehicle or a motorcycle. The desire for entertainment can be satisfied by watching a movie or attending a live theatrical performance. The price of a substitute-in-consumption is part of the other prices demand determinant. A change in the price of a substitute-in-consumption causes a change in demand and a shift of the demand curve. - An increase in the price of one substitute good causes an increase in demand for the other.
- A decrease in the price of one substitute good causes a decrease in demand for the other.
Shifting the Demand CurveTo illustrate this process consider two tasty substitute beverages--OmniCola and King Caffeine. Each provides comparable satisfaction to thirsty consumers. They buy one or they buy the other.| Substitute-in-Consumption |  |
How is the demand for OmniCola affected if the price of King Caffeine should change?- A Higher Price: Suppose the price of King Caffeine increases. Thirsty consumers making a beverage selection undoubtedly react according to the law of demand and decrease the quantity demanded of King Caffeine. However, in that consumers remain thirsty, they are bound to seek out a substitute beverage, such as OmniCola. The result is an increase in the demand for OmniCola and a rightward shift of the demand curve. Click the [Price Increase] button to demonstrate.
The beverage substitution between King Caffeine and OmniCola is due to a change in relative prices triggered by the change in the price of King Caffeine, given that the price of OmniCola remains constant. That is, even though the price of OmniCola does not change, it is relatively cheaper due to the higher price of King Caffeine.
- A Lower Price: Suppose the price of King Caffeine decreases. Thirsty consumers making a beverage selection now undoubtedly react according to the law of demand and increase the quantity demanded of King Caffeine. However, in that consumers are satisfying their thirst with King Caffeine, they are unlikely to buy as much of the substitute beverage, OmniCola. As such, the demand for OmniCola decreases and a leftward shift of the demand curve. Click the [Price Decrease] button to demonstrate.
The beverage substitution between King Caffeine and OmniCola is once again due to a change in relative prices triggered by the price of King Caffeine, with no change in the price of OmniCola. That is, even though the price of OmniCola does not change, it is relatively more expensive due to the lower price of King Caffeine.
Cross ElasticityClassifying a good as a substitute-in-consumption is accomplished in a precise manner using the cross elasticity of demand. The cross elasticity of demand is the relative response of the demand for one good to changes in the price of another good. More specifically, it is the percentage change in the demand of one good due to a percentage change in the rice of another good. A substitute-in-consumption is then one with a cross elasticity that is positive, or greater than zero. In comparison, a complement-in-consumption has a negative cross elasticity, or less than zero.
Recommended Citation:SUBSTITUTE-IN-CONSUMPTION, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2023. [Accessed: December 3, 2023].
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