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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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PHYSICAL SCIENCE

The scientific study of the physical world, especially nonhuman, nonsociety phenomena, such as atoms, planets, wildlife, and continental drift. Common disciplines that study these physical phenomena are physics, chemistry, biology, geology, and astronomy. Physical science is one of two broad scientific classifications. The other is social science, which is the study human behavior and society.

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APLS

PURPLE SMARPHIN
[What's This?]

Today, you are likely to spend a great deal of time watching the shopping channel hoping to buy either a flower arrangement in a coffee cup for your father or a how-to book on meeting people. Be on the lookout for the last item on a shelf.
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This isn't me! What am I?

A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"The road to success is always under construction. "

-- Lily Tomlin, Actress

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