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INELASTIC: In general, if changes in variable A cause changes in variable B, then the relative change in B is less than the relative change in A. In other words, large changes in variable A cause relatively smaller changes in variable B. An inelastic relationship between two variables is not a very responsive, or stretchable, relationship. You should compare inelastic with elastic.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius looking to buy either an electric coffee pot with automatic shutoff or a brown leather attache case. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"I shall do less whenever I shall believe what I am doing hurts the cause and I shall do more whenever I shall believe doing more will help the cause. I shall try to correct errors when shown to be errors and I shall adopt new views so fast as they shall appear to be true views. "

-- Abraham Lincoln, 16th US president

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