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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions 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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TAXATION PRINCIPLES

Taxes are the mandatory payments made by members of society to governments to finance government operations. The study of public finance identifies several key principles of taxation -- tax effects (revenue and allocation), tax proportionality (proportional, progressive, and regressive), tax payments (benefit and ability-to-pay), tax equity (horizontal and vertical).

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PURPLE SMARPHIN
[What's This?]

Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors seeking to buy either a large flower pot shaped like a Greek urn or a small palm tree that will fit on your coffee table. Be on the lookout for cardboard boxes.
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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.
"Don't waste your effort on a thing that results in a petty triumph unless you are satisfied with a life of petty issues. "

-- John D. Rockefeller, industrialist

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Strong Law of Large Numbers
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