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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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MARGINAL PRODUCT

The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal product, usually abbreviated MP, is found by dividing the change in total product by the change in the variable input. Marginal product, which occasionally goes by the alias marginal physical product (MPP), is one of two measures derived from total product. The other is average product.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either an AC adapter that works with your MPG player or rechargeable batteries. Be on the lookout for infected paper cuts.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"A ship ought not to be held by one anchor, nor life by a single hope. "

-- Epictetus, philosopher

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