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MARKET STRUCTURE: The manner in which a market is organized, based largely on the number of firms in the industry. The four basic market structure models are: perfect competition, monopoly, monopolistic competition, and oligopoly. The primary difference between each is the number of firms on the supply side of a market. Both perfect competition and monopolistic competition have a large number of relatively small firms selling output. Oligopoly has a small number of relatively large firms. And monopoly has a single firm.

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SCIENCE

A discipline, or topic of study, that uses the scientific method to investigate and explain the operation of the world by testing and verifying hypothesized relations. Science is commonly divided into physical sciences (including chemistry, physics, and biology) and social sciences (including economics, sociology, and political science). Science is not just a subject, but a method of investigation using the scientific method.

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Today, you are likely to spend a great deal of time at a dollar discount store looking to buy either a revolving spice rack or a how-to book on home repairs. Be on the lookout for door-to-door salesmen.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"Time is the scarcest resource, and unless it is managed nothing else can be managed."

-- Peter F. Drucker

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Marginal Propensity to Save
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