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ABSTRACTION METHODS: Abstraction is the process of simplifying the complexities of the real world by ignoring (hopefully) unimportant details, especially (for our purposes) while doing economic analysis. Three common methods of actual, real world abstraction used in economic theories are words, graphs, and equations. Words can be misunderstood. Graphs are a little more precise. And equations tend to be the most precise of the three.

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OLIGOPOLY, CHARACTERISTICS

The three most important characteristics of oligopoly are: (1) an industry dominated by a small number of large firms, (2) firms sell either identical or differentiated products, and (3) the industry has significant barriers to entry.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club looking to buy either a package of 4 by 6 index cards, the ones with lines or a 50 foot extension cord. Be on the lookout for broken fingernail clippers.
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This isn't me! What am I?

The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
"You just don't luck into things as much as you'd like to think you do. You build step by step, whether it's friendships or opportunities. "

-- Barbara Bush, first lady

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