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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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TOTAL VARIABLE COST AND MARGINAL COST

A mathematical connection between marginal cost and total variable cost stating that marginal cost IS the slope of the total variable cost curve. This relation between total variable cost and marginal cost is also seen with total cost. The slope of the total cost curve is marginal cost, as well. The relation between total variable cost and marginal cost is but another in the long line of applications of the total-marginal relation.

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Today, you are likely to spend a great deal of time looking for a downtown retail store seeking to buy either a set of tires or a birthday gift for your grandfather. Be on the lookout for gnomes hiding in cypress trees.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
"A leader, once convinced that a particular course of action is the right one, must . . . be undaunted when the going gets tough."

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