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OLIGOPOLY: A market structure dominated by a small number of large firms, selling either identical or differentiated products, and significant barriers to entry into the industry. This is one of four basic market structures. The other three are perfect competition, monopoly, and monopolistic competition.

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COMMON-PROPERTY GOODS

Goods characterized by rival consumption and the inability to exclude nonpayers. Common-property goods are one of four types of goods differentiated by consumption rivalry and nonpayer excludability. The other three goods are private (rival consumption and nonpayers can be excluded), public (nonrival consumption and nonpayers cannot be excluded), and near-public (nonrival consumption and nonpayers can be excluded). Nonrival consumption and the ease of excluding of nonpayers means common-property goods cannot be efficiently exchanged through markets and are often overconsumed.

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Today, you are likely to spend a great deal of time at a garage sale trying to buy either a coffee cup commemorating the 2000 Olympics or a birthday gift for your grandmother. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Natural gas has no odor. The smell is added artificially so that leaks can be detected.
"It is not because things are difficult that we do not dare; it is because we do not dare that they are difficult. "

-- Seneca, statesman, dramatist, philosopher

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