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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 FACTOR COST, MONOPSONY

The change in total factor cost resulting from a change in the quantity of factor input employed by a monopsony. Marginal factor cost, abbreviated MFC, indicates how total factor cost changes with the employment of one more input. It is found by dividing the change in total factor cost by the change in the quantity of input used. Marginal factor cost is compared with marginal revenue product to identify the profit-maximizing quantity of input to hire.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius looking to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The average length of a "business lunch" is about 36 minutes.
"How wonderful it is that nobody need wait a single moment before starting to improve the world."

-- Anne Frank

CES
Constant Elasticity of Substitution
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