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B: The common notation for the "slope" term of an equation specified as Y = a + bX. Mathematically, the b-slope term indicates the change in the value of the Y variable resulting from a unit change in the value of the X variable. Theoretically, the b-slope is frequently used to indicate endogenous or dependent relation between the Y and X variables. For example, if Y represents consumption and X represents national income, b measures induced consumption expenditures.

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PRODUCT LIFE CYCLE

The different stages that a product traverses over the course of its life from initial availability (birth) to eventual unavailability (death). The key stages are development, introduction, growth, maturity, saturation, and decline. The product life cycle, represented by an S-shaped curve, is an adaptation of the biological life cycle and is common to the study of marketing. It is also important in the analysis of innovation and economic instability. In addition to biological growth, comparable S-shaped life cycles are found in short-run production of a firm, the growth of a person's income, the acquisition of knowledge, and the development of a civilization.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a flower arrangement for your aunt or a birthday greeting card for your uncle. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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A half gallon milk jug holds about $50 in pennies.
"New ideas pass through three periods: - It can't be done. - It probably can be done, but it's not worth doing. - I knew it was a good idea all along!"

-- Arthur C. Clarke

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