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PI: The abbreviation for personal income, which is the total income received by the members of the domestic household sector, which may or may not be earned from productive activities during a given period of time, usually one year. Personal income is one of three measures of income reported quarterly (every three months) in the National Income and Product Accounts maintained by the Bureau of 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 going out of business sale hoping to buy either a rechargeable battery for your cell phone or a T-shirt commemorating the 2000 Olympics. Be on the lookout for cardboard boxes.
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Two and a half gallons of oil are needed to produce one automobile tire.
"As the births of living creatures at first are ill-shapen, so are all innovations, which are the births of time. "

-- Sir Francis Bacon, philosopher

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