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EMPIRICAL: Based on or relating to real world data or analysis. Empirical should be contrasted with the theoretical. Whereas theoretical refers to abstract representations, empirical is actual real world observations. Empirical observation is critical to the scientific method. Once an hypothesis implied by a theory, empirical observation is key to the verification process.

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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 touring the new suburban shopping complex trying to buy either a T-shirt commemorating the 2000 Olympics or a genuine fake plastic Tiffany lamp. Be on the lookout for crowded shopping malls.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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