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PERSONAL INCOME: 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, usually one year. The primary use of personal income is to measure the income actually paid out to the household sector. After adjusting for income taxes, personal income forms the basis for consumption expenditures on gross domestic product.

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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a wall poster commemorating the first day of winter or blue cotton balls. Be on the lookout for strangers with large satchels of used undergarments.
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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.
"Be civil to all; sociable to many; familiar with few; friend to one; enemy to none. "

-- Benjamin Franklin, statesman

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