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ABSTRACTION: Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is often criticized because it's, well, it's JUST NOT REALISTIC. However, when done correctly (ignoring things that JUST DON'T MATTER), then the pursuit of knowledge is greatly enhanced by abstraction. For example, when travelling cross country along a high-speed interstate highway, a paper road map is a handy tool. It shows towns and cities along the way, the major intersections, rest stop locations, and other important points of interest. However, it ignores unimportant details. It doesn't realistically show the location of every tree, bush, or blade of grass. Why bother? This information won't enhance your road trip.
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OPPORTUNITY COST The highest valued alternative foregone in the pursuit of an activity. Opportunity cost is a one of the most fundamental concepts used in the study of economics. An opportunity cost can be either explicit, usually involving a monetary payment, or implicit, which does not involve a transaction. Opportunity cost is also commonly termed economic cost.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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"Believe one who has tried it. " -- Virgil, Roman poet
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GATS
General Agreement on Trade in Services
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