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DERIVATION, AGGREGATE EXPENDITURES LINE: An aggregate expenditures line, a graphical depiction of the relation between aggregate expenditures and the level of aggregate income or production, can be derived by sequentially adding expenditures by the four macroeconomic sectors (household, business, government, and foreign). This derivation process begins with the consumption line, then adds investment, government purchases, and finally net exports. The process actually generates three alternative aggregate expenditures lines based on the number of sectors included (two sector, three sector, and four sector).

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OPPORTUNITY COST

The highest valued alternative foregone in the pursuit of an activity. Opportunity cost is a one of the most fundamental concepts used in the study of economics. An opportunity cost can be either explicit, usually involving a monetary payment, or implicit, which does not involve a transaction. Opportunity cost is also commonly termed economic cost.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a rechargeable battery for your computer or shoe laces for your snow boots. Be on the lookout for crowded shopping malls.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"Be kind and merciful. Let no one ever come to you without coming away better and happier."

-- Mother Teresa of Calcutta, humanitarian

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