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LINE GRAPH: A graph containing one or more lines or curves that are used to represent relations between two (or more) variables. A line graph is a useful method of illustrating scientific principles and hypotheses important for the economic analysis.

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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 at a flea market seeking to buy either a how-to book on fixing your computer, with illustrations or several magazines on computer software. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"It is not because things are difficult that we do not dare; it is because we do not dare that they are difficult. "

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