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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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ABSTRACTION

Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is an essential feature of the scientific method. Hypothesis verification, model construction, and comparative static analysis are not possible without abstraction.

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Today, you are likely to spend a great deal of time searching for a specialty store seeking to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
"Inside the ring or out, ain't nothing wrong with going down. It's staying down that's wrong. "

-- Muhammad Ali

TSP
Time Series Econometrics (software)
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