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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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RISK

The quantitative probability of different future outcomes occurring. The assignment of probabilities can be subjective (based on a "feeling") or objective (based on historical data). Risk is related to the concept of uncertainty, which is simply not knowing what the future holds. People have three alternative preferences when confronting risk -- risk aversion, risk neutrality, and risk loving. Risk aversion is key to the provision of insurance.

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Today, you are likely to spend a great deal of time flipping through the yellow pages trying to buy either a green fountain pen or a handcrafted bird house. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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