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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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FIFTH RULE OF IMPERFECTION: The fifth of seven basic rules of the economy. It is the observation that the real world is not perfect. This means markets often fail to achieve efficiency because of several failings. This also means that government seldom enacts the policies needed to correct market failings. We are usually faced with the lesser of evils.

     See also | seven rules | efficiency | government | market failure | economic policies | public choice |


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LEAKAGES LINE

A graphical representation of the relation between the level of aggregate production and one or more leakages. The three leakages (non-consumption uses of the income generated from aggregate production) are saving, taxes, and imports. The leakages line sequentially adds, or layers, each of these three uses of income depending on the number of sectors used in the analysis (two, three, or four). The slope of the leakages line depends on which if any of the uses of income are induced by aggregate production. The leakages line is combined with the injections line (containing investment expenditures, government purchases, and exports) in the Keynesian injections-leakages model.

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Today, you are likely to spend a great deal of time driving to a factory outlet seeking to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Potato chips were invented in 1853 by a irritated chef repeatedly seeking to appease the hard to please Cornelius Vanderbilt who demanded french fried potatoes that were thinner and crisper than normal.
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