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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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EXPLICIT COST

An opportunity cost that involves a monetary payment or some other form of compensation. The monetary payment is generally made to compensate the person who initially foregoes the satisfaction. This payment, in effect, transfers the burden of the opportunity cost from the original person to the one making payment. Explicit cost is also commonly termed out-of-pocket or accounting cost, and occasionally explicit opportunity cost.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for broken fingernail clippers.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"Every generation of Americans needs to know that freedom exists not in doing what we like, but in having the right to do what we ought. "

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