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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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MARGINAL PRODUCT: The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal product, usually abbreviated MP, is found by dividing the change in total product by the change in the variable input. Marginal product lies at the very foundation of the analysis of short-run production and the subsequent explanation of the law of supply and the upward-sloping supply curve, using the law of diminishing marginal returns.

     See also | total product | output | input | variable input | fixed input | average product | marginal cost | law of diminishing marginal returns | average-marginal rule | total-marginal rule | short-run production | marginal physical product |


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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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