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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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AVERAGE PRODUCT

The quantity of total output produced per unit of a variable input, holding all other inputs fixed. Average product, usually abbreviated AP, is found by dividing total product by the quantity of the variable input. Average product, which occasionally goes by the alias average physical product (APP), is one of two measures derived from total product. The other is marginal product.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time searching the newspaper want ads wanting to buy either a flower arrangement with daisies and carnations for your uncle or a coffee cup commemorating next Thursday. Be on the lookout for slightly overweight pizza delivery guys.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
"New ideas pass through three periods: - It can't be done. - It probably can be done, but it's not worth doing. - I knew it was a good idea all along!"

-- Arthur C. Clarke

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