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GROSS DOMESTIC INCOME: The total market value of all final goods and services produced within the political boundaries of an economy during a given period of time, usually a year, as calculated using the income approach to measuring gross domestic product. Gross domestic income, abbreviated GDI, is virtually identical to gross domestic product (GDP), with one minor difference, the statistical discrepancy. As a matter of fact, the statistical discrepancy is identified as the difference between GDP and GDI.

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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 searching for rummage sales trying to buy either several magazines on computer software or a T-shirt commemorating the second moon landing. Be on the lookout for defective microphones.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
"My philosophy of life is that if we make up our mind what we are going to make of our lives, then work hard toward that goal, we never lose - somehow we win out."

-- President Ronald Reagan

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