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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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ELASTICITY DETERMINANTS

Three factors that affect the numerical value of the price elasticity of demand and the price elasticity of supply--availability of substitutes, time period of analysis, and proportion of budget. The price elasticities of demand and/or supply for a good can change if these determinants change. The first two determinants are important to both price elasticity of demand and price elasticity of supply, while the third relates specifically to the price elasticity of demand.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either a wall poster commemorating next Thursday or a pair of gray heavy duty boot socks. Be on the lookout for jovial bank tellers.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Believe and act as if it were impossible to fail."

-- Charles F. Kettering

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