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NORMAL GOOD: A good for which an increase in income causes an increase in demand, or a rightward shift in the demand curve. If demand increases as income increases, it is a normal good or a good with a positive income elasticity of demand. A normal good is one of two alternatives falling within the income determinant of demand. The other is an inferior good.

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AVERAGE FACTOR COST AND MARGINAL FACTOR COST

A mathematical connection between average factor cost and marginal factor cost stating that the change in the average factor cost depends on a comparison between average factor cost and marginal factor cost. For perfect competition, with no market control, marginal factor cost is equal to average factor cost, and average factor cost does not change. For monopsony and other firms with market control, marginal factor cost is greater than average factor cost, and average factor cost rises.

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Today, you are likely to spend a great deal of time browsing about a thrift store looking to buy either a black duffle bag with velcro closures or any book written by Isaac Asimov. Be on the lookout for letters from the Internal Revenue Service.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"It has been my philosophy of life that difficulties vanish when faced boldly. "

-- Isaac Asimov

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