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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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PRODUCT DIFFERENTIATION

Slight differences that exist between two or more goods that are essentially the same and which satisfy the same basic want or need. This is generally pursued in monopolistic competition and oligopoly by firms seeking to increase sales and profit. Many of the best known businesses in the economy practice product differentiation to gain an advantage on the competition and to acquire a bit of market control. For example, Coca-Cola and Pepsi-Cola are very similar, but each has a few differences in terms of taste, packaging, and esteem.

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Today, you are likely to spend a great deal of time lost in your local discount super center trying to buy either a T-shirt commemorating the second moon landing or a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for slightly overweight pizza delivery guys.
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A half gallon milk jug holds about $50 in pennies.
"Luck is what happens when preparation meets opportunity. "

-- Seneca, Roman philosopher

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