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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 its output. Marginal productivity theory indicates that the demand for a factor of production input is based on the marginal product of the factor and the price of the output produced by the factor.

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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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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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