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S-I MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment, I) and leakages (saving, S) for the two basic sectors (household and business). Equilibrium is achieved at the intersection of the saving line, S, and the investment line, I.

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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 strolling through a department store seeking to buy either a coffee cup commemorating the 1960 Presidential election or a how-to book on fixing your computer, with illustrations. Be on the lookout for door-to-door salesmen.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail. "

-- Napoleon Hill, author

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