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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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FACTOR MARKET, EFFICIENCY

A factor market achieves efficiency in the allocation of resources by equating marginal revenue product to factor price. Perfect competition, as the efficiency benchmark, is the only market structure to satisfy this criterion and achieve factor market efficiency. Monopsony, oligopsony, and monopsonistic competition are inefficient because they equate marginal revenue product to marginal factor cost, both of which are greater than factor price.

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Today, you are likely to spend a great deal of time surfing the Internet seeking to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for deranged pelicans.
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The average bank teller loses about $250 every year.
"I think luck is the sense to recognize an opportunity and the ability to take advantage of it . The man who can smile at his breaks and grabs his chance gets on."

-- Samuel Goldwyn, Film executive

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American Assocation of Commodity Traders
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