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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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COMPETITION

In general, the actions of two or more rivals in pursuit of the same objective. In an economic context, the specific objective pursued is usually either selling goods to buyers or buying goods from sellers.

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Today, you are likely to spend a great deal of time wandering around the shopping mall seeking to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for slightly overweight pizza delivery guys.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"Security can only be achieved through constant change, through discarding old ideas that have outlived their usefulness and adapting others to current facts. "

-- William O. Douglas, Supreme Court Justice

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