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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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DEADWEIGHT LOSS

The decrease in the sum of consumer surplus and producer surplus that results from the imposition of a tax. When a tax drives a wedge between demand price and supply price it disrupts what otherwise would be an efficient market equilibrium. Inefficiency arises because while a portion of the sum of consumer and producer surplus is merely transferred to government, a portion of this sum also disappears. The part that disappears is the deadweight loss and is an indicator of the inefficiency of the tax.

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Today, you are likely to spend a great deal of time at a going out of business sale trying to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for fairy dust that tastes like salt.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"The only profit center is the customer."

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