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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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PRINCIPAL-AGENT PROBLEM

A disconnection or conflict between the objectives and goals of the principal and those of the agent authorized to represent the principal. The principal-agent problem arises because an agent is given the responsibility and authority to take actions that affect both the principal, but can also affect the agent. This problem is common in corporate management, where the principal is shareholders and the agent is managers. It is also common in government, where the principal is the public and the agent is elected leaders.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius seeking to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for gnomes hiding in cypress trees.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"There's only one corner of the universe you can be certain of improving and that's your own self. "

-- Aldous Huxley, writer

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