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INJECTION LINE: A line used in the injection-leakage model representing the relation between non-consumption expenditures (that is, injections) and national income. The three injections are investment expenditures, government purchases, and exports. The foundation of the injection line is the investment line, which is then enhanced by adding government purchases and exports. The other part of the injection-leakage model is a line representing leakages. The intersection of the injection and leakage lines identifies equilibrium aggregate output, or Keynesian equilibrium.

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UTILITY MAXIMIZATION

The process or goal of obtaining the highest level of utility from the consumption of goods or services. The goal of maximizing utility is a key assumption underlying consumer behavior studied in consumer demand theory. Consumers are assumed to make choices, especially concerning the purchase of goods, such that they obtain the highest possible level of satisfaction. Utility maximization can be achieved at the peak of the total utility curve.

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Today, you are likely to spend a great deal of time surfing the Internet trying to buy either a package of 4 by 6 index cards, the ones with lines or a 50 foot extension cord. Be on the lookout for mail order catalogs with hidden messages.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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