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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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NORMAL GOOD

A good for which a change in income causes a comparable change in demand. That is, an increase in income causes an increase in demand and a decrease in income causes a decrease in demand. The income elasticity of demand for a normal good is positive. A normal good is one of two alternatives falling within the buyers' income demand determinant. The other is an inferior good.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a rechargeable battery for your cell phone or a T-shirt commemorating the 2000 Olympics. Be on the lookout for telephone calls from long-lost relatives.
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A half gallon milk jug holds about $50 in pennies.
"I do the best I know how, the very best I can, and I mean to keep doing so until the end. "

-- Abraham Lincoln, 16th US president

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