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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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INCREASING RETURNS TO SCALE

A given proportional change in all resources in the long run results in a proportional greater change in production. Increasing returns to scale exists if a firm increases ALL resources--labor, capital, and other inputs--by a given proportion (say 10 percent) and output increases by more than this proportion (that is more than 10 percent). This is one of three returns to scale. The other two are decreasing returns to scale and constant returns to scale.

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Today, you are likely to spend a great deal of time driving to a factory outlet trying to buy either a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or a rechargeable battery for your cell phone. Be on the lookout for jovial bank tellers.
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Three-forths of the gold mined each year is used to manufacture jewelry.
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