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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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SCARCITY

A pervasive condition of human existence that results because society has unlimited wants and needs, but limited resources used for their satisfaction. This fundamental condition is the common thread that binds all of the topics studied in economics.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors hoping to buy either a wall poster commemorating the 2000 Presidential election or a rechargeable flashlight. Be on the lookout for strangers with large satchels of used undergarments.
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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
"Concentration is the secret of strength in politics, in war, in trade, in short in all management of human affairs. "

-- Ralph Waldo Emerson, philosopher, poet

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