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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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CONSUMER DEMAND THEORY

The branch of economics devoted to the study of consumer behavior, especially as it applies to decisions related to purchasing goods and services through markets. Consumer demand theory is largely centered on the study and analysis of the utility generated from the satisfaction of wants and needs. The key principle of consumer demand theory is the law of diminishing marginal utility, which offers an explanation for the law of demand and the negative slope of the demand curve.

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APLS

GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either a pair of leather sandals that won't cause blisters or clothing for your kitty cats. Be on the lookout for small children selling products door-to-door.
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The average length of a "business lunch" is about 36 minutes.
"I not only use all the brains that I have, but all that I can borrow. "

-- Woodrow Wilson, 28th US president

MPC
Marginal Propensity to Consume
A PEDestrian's Guide
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