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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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HYPOTHESIS

A reasonable proposition about the workings of the world that is inspired or implied by a theory and which may or may not be true. A hypothesis is essentially a prediction made by a theory that can be compared with observations in the real world. A hypothesis usually takes the form: "If A, then also B." The essence of the scientific method is to test, or verify, hypotheses against real world data. If supported by data over and over again, a hypothesis becomes a principle.

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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 storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for the happiest person in the room.
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More money is spent on gardening than on any other hobby.
"Genius is an infinite capacity for taking pains. "

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