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MATURITY STAGE: The third stage in the product life cycle, characterized by flattening of sales and decreasing profit margins. Advertising and promotion are used to maintain market share and to prevent the erosion of sales and profits. During this stage, the initial decline of a product begins and many businesses try to "re-invent" their products to prevent the upcoming decline stage. Many times the company finds new uses for an existing product (baking soda as a deodorizer), totally new markets (foreign countries), or a way to enhance the existing product to make it better and to re-start the life cycle. The television has gone through at least two life cycles, first from black and white to color and then from color to high definition (HD) and plasma. Along the way there were enhancements such as remote control, VCRs to complement them, and cable to help with reception.

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SAVING FUNCTION

A mathematical relation between saving and income by the household sector. The saving function can be stated as an equation, usually a simple linear equation, or as a diagram designated as the saving line. This function captures the saving-income relation, the flip side of the consumption-income relation that forms one of the key building blocks for Keynesian economics. The two key parameters of the saving function are the intercept term, which indicates autonomous saving, and the slope, which is the marginal propensity to save and indicates induced saving. The injections-leakages model used in Keynesian economics is based on the saving function.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a toaster oven that has convection cooking or a birthday gift for your mother. Be on the lookout for slow moving vehicles with darkened windows.
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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.
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