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MACROECONOMIC SECTORS: The four aggregate sectors of the macroeconomy--household, business, government, and foreign--that reflect four key macroeconomic functions and are responsible for four expenditures on gross domestic product. These four sectors are the primary "actors" on the macroeconomic stage. Macroeconomic theories then explain macroeconomic phenomena by exploring the interaction among these four sectors.

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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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ORANGE REBELOON
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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a velvet painting of Elvis Presley or a wall poster commemorating yesterday. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
"In a restless, creative business with an emphasis on experiment and development, ideas are the lifeblood."

-- Richard Branson, Virgin Group founder

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