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COMMAND ECONOMY: An economy in which the government uses its coercive powers (such as command and control) to answer the three questions of allocation. This is the real world version of the idealized theoretical pure command economy. While in this real world version some allocation decisions are undertaken by markets, the vast majority are made through central planning. The two most notable command economies of the 20th century were the communist/socialist economic systems of China and the Soviet Union.

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VERTICAL ADDITION: In graphical analysis, the technique of combining two curves by adding the value of the variable on the vertical or Y axis for a given value of the variable on the horizontal or X axis. This is commonly used for deriving the demand curve for a public good from a set of individual demand curves. The demand price that each individual buyer is willing to pay is added for a given quantity to identify the total benefits obtained.

     See also | vertical axis | horizontal axis | horizontal addition | public good | demand curve |


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PRICE ELASTICITY OF SUPPLY

The relative response of a change in quantity supplied to a change in price. More specifically the price elasticity of supply is the percentage change in quantity supplied due to a percentage change in price. This notion of elasticity captures the supply side of the market. A comparable elasticity on the demand side is the price elasticity of demand. Other notable supply elasticities are income elasticity of demand and cross elasticity of demand.

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Today, you are likely to spend a great deal of time watching the shopping channel looking to buy either a flower arrangement for your aunt or a birthday greeting card for your uncle. Be on the lookout for door-to-door salesmen.
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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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