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RIVAL CONSUMPTION: Consumption of a good by one person imposes a cost on, or prevents consumption of the good by, another person. Some goods, like food, have extremely rival consumption. One person, and only one person, gets the benefit. Other goods, like national defense, have no consumption rivalry, everyone can benefit simultaneously without imposing a cost on others. This is one of the two key characteristics of a good (the other is excludability) that distinguishes between common-property goods, near-public goods, private goods, and public goods.

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DEMAND INCREASE

An increase in the willingness and ability of buyers to purchase a good at the existing price, illustrated by a rightward shift of the demand curve. An increase in demand is caused by a change in a demand determinant and results in an increase in equilibrium quantity and an increase in equilibrium price. A demand increase is one of two demand shocks to the market. The other is a demand decrease.

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Today, you are likely to spend a great deal of time watching the shopping channel seeking to buy either a coffee cup commemorating the moon landing or a how-to book on surfing the Internet. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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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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