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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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AVERAGE VARIABLE COST CURVE

A curve that graphically represents the relation between average variable cost incurred by a firm in the short-run product of a good or service and the quantity produced. This curve is constructed to capture the relation between average variable cost and the level of output, holding other variables, like technology and resource prices, constant. The average variable cost curve is one of three average curves. The other two are average total cost curve and average fixed cost curve. A related curve is the marginal cost curve.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for deranged pelicans.
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Two and a half gallons of oil are needed to produce one automobile tire.
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LPG
Liquid Petroleum Gas
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