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PI: The abbreviation for personal income, which 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, usually one year. Personal income is one of three measures of income reported quarterly (every three months) in the National Income and Product Accounts maintained by the Bureau of Economic Analysis.

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PERFECT COMPETITION, SHORT-RUN SUPPLY CURVE

A perfectly competitive firm's supply curve is that portion of its marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along its positively-sloped marginal cost curve in response to changing prices.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers trying to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for high interest rates.
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The average bank teller loses about $250 every year.
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