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ENTRY BARRIER: 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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INCOME ELASTICITY OF DEMAND

The relative response of a change in demand to a change in income. More specifically the income elasticity of demand is the percentage change in demand due to a percentage change in buyers' income. This notion of elasticity captures the buyers' income demand determinant. Three other notable elasticities are the price elasticity of demand, the price elasticity of supply, and the cross elasticity of demand.

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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either any book written by Stephan King or a T-shirt commemorating next Thursday. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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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.
"Executives who get there and stay suggest solutions when they present the problems. "

-- Malcolm Forbes, business executive

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Pacific Stock Exchange (US, LA and San Francisco)
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