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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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INVISIBLE HAND

The notion that buyers and sellers, consumers and producers, households and businesses, by pursuing their own self-interests do what is best for the economy automatically without any government intervention, as if guided by an invisible hand.

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Today, you are likely to spend a great deal of time at the confiscated property police auction trying to buy either a lighted magnifying glass or a small, foam rubber football. Be on the lookout for pencil sharpeners with an attitude.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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