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MARGINAL FACTOR COST AND AVERAGE FACTOR COST: The relation between marginal factor cost and average factor cost is comparable to other average-marginal relations found in the study of economics. For a firm that hires factors in a perfectly competitive factor market, marginal factor cost and average factor cost are equal, and equal to the factor market price. All three are represented by a horizontal, or perfectly elastic, curve equal to the factor market price. For a firm that hires factors in an imperfectly competitive factor market, especially monopsony, marginal factor cost is greater than both average factor cost and the factor market price.

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INJECTIONS LINE

A graphical representation of the relation between the level of aggregate production and one or more injections. The three injections (non-consumption expenditures on aggregate production) are investment expenditures, government purchases and exports. The injections line sequentially adds, or layers, each of these three expenditures depending on the number of sectors used in the analysis (two, three, or four). The slope of the injections line depends on which if any of the expenditures are induced by aggregate production. The injections line is combined with the leakages line (containing saving, taxes, and imports) in the Keynesian injections-leakages model.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either a looseleaf notebook binder or hand lotion, a big bottle of hand lotion. Be on the lookout for telephone calls from former employers.
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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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