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THREE-SECTOR INJECTIONS-LEAKAGES MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment and government purchases) and leakages (saving and taxes) for the three domestic sectors (household, business, and government). Equilibrium is achieved at the intersection of the saving and tax line, S + T, and the investment and government purchases line, I + G.

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PROFIT

Generally speaking, the difference between revenue received by a firm for production and cost incurred in the production, or the excess of revenue over cost. Three specific notions of profit exist, each with a different meaning. Accounting profit is the difference between revenue and accounting cost. Economic profit is the difference between revenue and total opportunity cost. Normal profit is opportunity cost of entrepreneurship. Profit is occasionally used synonymously with the term rent, or economic rent.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius wanting to buy either a wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for malfunctioning pocket calculators.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
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