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MARGINAL REVENUE CURVE, MONOPOLY: A curve that graphically represents the relation between marginal revenue received by a monopoly for selling its output and the quantity of output sold. The marginal revenue curve reflects the market control held by a monopoly firm. For a monopoly firm with complete market control, the marginal revenue curve is negatively-sloped. Moreover, for a given quantity of output, marginal cost is less than price, and the marginal revenue curve lies below the demand curve.

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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 at a dollar discount store looking to buy either a set of serrated steak knives, with durable plastic handles or a pair of blue silicon oven mitts. Be on the lookout for rusty deck screws.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"How wonderful it is that nobody need wait a single moment before starting to improve the world. "

-- Anne Frank, diarist

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