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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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MARGINAL PROPENSITY TO SAVE

The proportion of each additional dollar of household income that is used for saving. The marginal propensity to save (abbreviated MPS) is another term for the slope of the saving line and is calculated as the change in saving divided by the change in income. The MPS plays a central role in Keynesian economics. It quantifies the saving-income relation, which is the flip side of the consumption-income relation, and thus it reflects the fundamental psychological law. It is also a critical to the multiplier process. A related saving measure is the average propensity to save.

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Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for broken fingernail clippers.
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Three-forths of the gold mined each year is used to manufacture jewelry.
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