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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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AGGREGATE MARKET

An economic model relating the price level and real production that is used to analyze business cycles, gross production, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The aggregate market, inspired by the standard market model, but adapted to the macroeconomy, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers). Also known by the names AS-AD model or income-price model, the aggregate market is THE cornerstone model of macroeconomic analysis.

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Today, you are likely to spend a great deal of time at a garage sale seeking to buy either decorative garden figurines or a wall poster commemorating last Friday (you know why). Be on the lookout for strangers with large satchels of used undergarments.
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A half gallon milk jug holds about $50 in pennies.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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