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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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LAW OF DEMAND

The inverse relationship between demand price and the quantity demanded, assuming ceteris paribus factors are held constant. This fundamental economic principle indicates that a decrease the price of a commodity results in an increase in the quantity of the commodity that buyers are willing and able to purchase in a given period of time, if other factors are held constant. The law of demand is one of the most important principles found in the study of economics.

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Today, you are likely to spend a great deal of time watching infomercials seeking to buy either a tall storage cabinet with five shelves and a secure lock or a birthday greeting card for your grandmother. Be on the lookout for malfunctioning pocket calculators.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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