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February 13, 2026 

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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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TANSTAAFL: A rather cumbersome and usually hard to remember acronym for the expression "There ain't no such thing as a free lunch. This is a favorite saving of many economists because it highlights, albeit in a grammatically questionable manner, the fundamental problem of scarcity. The phrase serves to emphasize that seemingly "free" lunches are not really free. While they might be free to the customer, someone must pay, that is, incur an opportunity cost of foregone production. The lunch eaten by one person cannot be eaten by another.

     See also | free lunch | scarcity | opportunity cost | scarce resource | scarce good |


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LOSS MINIMIZATION RULE

A rule stating that a firm minimizes economic loss by producing output in the short run that equates marginal revenue and marginal cost if price is less than average total cost but greater than average variable cost. This is one of three short-run production alternatives facing a firm. The other two are profit maximization (if price exceeds average total cost) and shutdown (if price is less than average variable cost).

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time at an auction wanting to buy either a how-to book on fixing your computer, with illustrations or several magazines on computer software. Be on the lookout for mail order catalogs with hidden messages.
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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.
"Don't be afraid if things seem difficult in the beginning. That's only the initial impression. The important thing is not to retreat; you have to master yourself."

-- Olga Korbut, Gymnast

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