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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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COST

An alternative term for economic or opportunity cost, which is the highest valued alternative foregone in the pursuit of an activity. Opportunity cost is one of the most fundamental concepts used in the study of economics, hence when the term cost is used in the study of economics without modification, it usually means economic or opportunity cost.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either yellow cotton balls or a set of steel-belted radial snow tires. Be on the lookout for the happiest person in the room.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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