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August 19, 2026 

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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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POINT ELASTICITY

The relative responsiveness of a change in one variable (call it B) to an infinitesimally small change in another variable (call it A). The notion of point elasticity typically comes into play when discussing the elasticity at a specific point on a curve.

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APLS

PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time at a going out of business sale hoping to buy either a T-shirt commemorating the 2000 Olympics or a genuine fake plastic Tiffany lamp. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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Al Capone's business card said he was a used furniture dealer.
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CCAPM
Consumption-Based Capital Asset Pricing Model
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