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NATIONAL INCOME AND PERSONAL INCOME: National income (NI) is the total income earned by the citizens of the national economy resulting from their ownership of resources used in the production during a given period of time, usually one year. Personal income (PI) is the total income received by the members of the domestic household sector, which may or may not be earned from productive activities during a given period of time. Personal income can be derived from national income by subtracting income earned but not received (IEBNR) and adding income received but not earned (IRBNE).

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U-SHAPED COST CURVES

The family of short-run cost curves consisting of average total cost, average variable cost, and marginal cost, all of which have U-shapes. Each is U-shaped because it begins with relatively high but falling cost for small quantities of output, reaches a minimum value, then has rising cost at large quantities of output. Although the average fixed cost curve is not U-shaped, it is occasionally included with the other three just for sake of completeness.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either a large red and white striped beach towel or a bottle of blackcherry flavored spring water. Be on the lookout for gnomes hiding in cypress trees.
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In the early 1900s around 300 automobile companies operated in the United States.
"Well done is better than well said. "

-- Benjamin Franklin, statesman, inventor

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