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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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AVERAGE REVENUE AND MARGINAL REVENUE

A mathematical connection between average revenue and marginal revenue stating that the change in the average revenue depends on a comparison between average revenue and marginal revenue. For perfect competition, with no market control, marginal revenue is equal to average revenue, and average revenue does not change. For monopoly and other firms with market control, marginal revenue is less than average revenue, and average revenue falls.

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Today, you are likely to spend a great deal of time at a going out of business sale trying to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for slightly overweight pizza delivery guys.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"It is very rare that you meet with obstacles in this world (that) the humblest man has not the faculties to surmount. "

-- Henry David Thoreau, philosopher

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