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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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CONSUMPTION RIVALRY

Whether or not the consumption of a particular good by one person prevents simultaneous consumption by another person. In other words, does consumption impose an opportunity cost on others. Rival consumption occurs if the consumption by one imposes an opportunity cost on others because others are prevented from consuming the good. Nonrival consumption occurs if the consumption by one does not impose an opportunity cost on others because others are not prevented from consuming the good. When combined with nonpayer excludability, the result is four alternative types of goods -- private, public, common-property, and near-public.

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APLS

BROWN PRAGMATOX
[What's This?]

Today, you are likely to spend a great deal of time touring the new suburban shopping complex wanting to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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This isn't me! What am I?

Rosemary, long associated with remembrance, was worn as wreaths by students in ancient Greece during exams.
"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

-- Rene Descartes

IROR
Internal Rate of Return
A PEDestrian's Guide
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