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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 PHYSICAL PRODUCT

The quantity of total output produced per unit of a variable input, holding all other inputs fixed. Average physical product, usually abbreviated APP, is found by dividing total physical product by the quantity of the variable input. Average product, which more often goes by the shorter name average product (AP), is one of two measures derived from total physical product. The other is marginal physical product.

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Today, you are likely to spend a great deal of time searching for rummage sales hoping to buy either a remote controlled train set or a genuine down-filled snow parka. Be on the lookout for infected paper cuts.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Do not think a man has done his full duty when he has performed the work assigned him. A man will never rise if he does only this. Promotion comes from exceptional work. "

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