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A POSTERIORI: A conclusion reached through logical reasoning based on facts and observations about the real world. This notion is closely related to the scientific verification of hypotheses and the identification of principles. A similar sounding, but opposite term is a prior, which is a unverified presumption made before an analysis is undertaken. For example, in the study of economics of crime you might assume, a priori, that people are basically "good", 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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SIMPLE TAX MULTIPLIER

A measure of the change in aggregate production caused by changes in a government taxes that shocks the macroeconomy, when consumption is the ONLY induced expenditure. The simple tax multiplier is the negative marginal propensity to consume times the inverse of one minus the marginal propensity to consume. A related multiplier is the simple expenditures multiplier, which measures the change in aggregate production caused by changes in an autonomous expenditure.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a battery-powered, rechargeable vacuum cleaner or a remote controlled World War I bi-plane. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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The average length of a "business lunch" is about 36 minutes.
"The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as long as we live."

-- Mortimer Adler

MSE
Mean Squared Error
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