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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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THEORY

An empirically verified, interrelated body of general principles, axioms, and assumptions that is used to explain and understand real world phenomena. Theories are the cornerstone of the scientific method. They generate the hypotheses that are verified against real world data. The construction and refinement of theories, accomplished through the hypothesis verification process, is the primary goal of doing science.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex hoping to buy either handcrafted decorations to hang on your walls or throw pillows for your bed. Be on the lookout for door-to-door salesmen.
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The average bank teller loses about $250 every year.
"Difficulty is the excuse history never accepts. "

-- Edward R. Murrow, News broadcaster

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