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A PRIORI: A presumption made before an analysis is undertaken, often based on experiences, beliefs, or deductions from seemingly self-evident propositions about how the world works. This is a Latin for assumption or axiom. A similar sounding, but opposite term is a posteriori, which is derived from observation or facts. For example, in the study of economics of crime you might assume, a priori, that people are basically "good", because that just seems to be part of human nature, and conclude, a posteriori, that people are more likely to commit crimes when the threat of capture and conviction is lower.

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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 at a dollar discount store hoping to buy either looseleaf notebook paper or a three-hole paper punch. Be on the lookout for mail order catalogs with hidden messages.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"Success is more a function of consistent common sense than it is of genius. "

-- An Wang, industrialist

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