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OPPORTUNITY COST: The highest valued alternative foregone in the pursuit of an activity. This is a hallmark of anything dealing with economics--and life for that matter--because any action that you take prevents you from doing something else. The ultimate source of opportunity cost is the pervasive problem of scarcity (unlimited wants and needs, but limited resources). Whenever limited resources are used to satisfy one want or need, there are an unlimited number of other wants and needs that remain unsatisfied. Herein lies the essence of opportunity cost. Doing one thing prevents doing another.

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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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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time driving to a factory outlet hoping to buy either a how-to book on home remodeling or a tall storage cabinet with five shelves and a secure lock. Be on the lookout for pencil sharpeners with an attitude.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as long as we live."

-- Mortimer Adler

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