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BARRIER TO ENTRY: An institutional, government, technological, or economic restriction on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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FACTOR SUPPLY CURVE

A graphical representation of the relation between the price to a factor of production and quantity of the factor supplied, holding all ceteris paribus factor supply determinants constant. The factor supply curve is one half of the factor market. The other half is the factor demand curve.

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Today, you are likely to spend a great deal of time at the confiscated property police auction looking to buy either a flower arrangement with anything but tulips for your grandfather or a birthday greeting card for your mother that doesn't look like a greeting card. Be on the lookout for telephone calls from former employers.
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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.
"The truth of the matter is that you always know the right thing to do. The hard part is doing it."

-- Norman Schwarzkopf, US Army general

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