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ACTUAL INVESTMENT: Investment expenditures that the business sector actual undertakes during a given time period, including both planned investment and any unplanned inventory changes. This is a critical component of Keynesian economics and the analysis of macroeconomic equilibrium, which occurs when actual investment is equal to planned investment. The difference between planned and actual investment is unplanned investment, which is inventory changes caused by a difference between aggregate expenditures and aggregate output. Should actual and planned investment differ, then aggregate expenditures are not equal to aggregate output, and the macroeconomy is not in equilibrium.

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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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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time searching for a specialty store wanting to buy either a video camera with stop action features or one of those memory foam pillows. Be on the lookout for strangers with large satchels of used undergarments.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"My future starts when I wake up every morning . . . Every day I find something creative to do with my life. "

-- Miles Davis, musician

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Journal of Economic Perspectives
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