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SHORT-RUN SUPPLY CURVE, MONOPOLY: Market control by a monopoly firm means that it does not have a supply relation between the quantity of output produced and the price. By way of comparison a perfectly competitive firm does have a short-run supply curve. Market control by a monopoly means that it price is NOT equal to marginal revenue, and thus it does NOT equate marginal cost and price. As such, a monopoly firm does not move along it's marginal cost curve. A monopoly does not necessarily supply larger quantities at higher prices or smaller quantities at lower prices.

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FOUR-SECTOR INJECTIONS-LEAKAGES MODEL

A variation of the Keynesian injections-leakages model that adds the foreign sector to the three domestic sectors--the household sector, the business sector, and the government sector. This variation adds the foreign to the three domestic sectors (household, business, and government) in the three-sector model and provides an alternative to the four-sector aggregate expenditures (Keynesian cross). It provides the complete Keynesian representation of the macroeconomy, including the export-import interaction between the domestic economy and the foreign sector. Equilibrium is identified as the intersection between the S + T + M line and the I + G + X line. Two related variations are the two-sector injections-leakages model and the three-sector injections-leakages model.

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Today, you are likely to spend a great deal of time flipping through the yellow pages seeking to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for broken fingernail clippers.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
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