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LONG-RUN MARGINAL COST CURVE: A graphical representation of the relationship between long-run marginal cost and the quantity of output produced. Like other marginal curves, the long-run marginal cost curve follows the average-marginal rule relative to the long-run average cost curve. In all outward appearance, the long-run marginal cost curve looks very much like the short-run marginal cost, that is, it is U-shaped. However, the U-shape is attributable to returns to scale rather than increasing and decreasing marginal returns.
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                           GOVERNMENT PURCHASES LINE: A graphical depiction of the relation between government purchases by the government sector and the economy's aggregate level of income or production. This relation plays a key role in the study of Keynesian economics. A government purchases line is characterized by vertical intercept, which indicates autonomous government purchases, and slope, which is the marginal propensity for government purchases and indicates induced government purchases. The aggregate expenditures line used in Keynesian economics is derived by adding or stacking the government purchases line onto the consumption line, as well as investment expenditures and net exports. The government purchases line shows the relation between government purchases by the government sector and aggregate income or production. The income and production measures most commonly used are national income and gross domestic product. The purpose of the government purchases line is to graphically illustrate the government purchases-income relation for the government sector, which is then integrated into the aggregate expenditures line used in Keynesian economics.The government purchases line is commonly presented in one of two forms reflecting autonomous government purchases and induced government purchases. The simplest is a horizontal government purchases line, one with a zero slope, that illustrates autonomous government purchases. With a horizontal line, government purchases are constant for all levels of aggregate income or production, hence autonomous and unaffected by income. A more realistic government purchases line is positively sloped, indicating a degree of induced government purchases. In this case, the vertical intercept, or Y-intercept, of the government purchases line marks autonomous government purchases and the slope represents induced government purchases. Of no small importance, the slope of the government purchases line is also the marginal propensity for government purchases (MPG). | Government Purchases Line | 
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The horizontal red line, labeled G in the exhibit to the right, indicates government purchases that are completely autonomous. There are no induced government purchases indicated by this line. The slope of the government purchases line is zero (MPG = 0). The intercept of this horizontal line indicates autonomous government purchases, which is $2 trillion in this case.An alternative government purchases line, one with induced government purchases, can be illustrated in the exhibit with a simple click of the [An Induced Line] button. The new red line, labeled G' in the exhibit, is positively sloped, indicating that a change in the level of income or production induces a change in government purchases. This new government purchases line actually indicates both induced government purchases and autonomous government purchases. The slope is induced government purchases and the intercept is autonomous government purchases. - Slope: The slope of this new government purchases line is positive, but less than one. In this case the slope is equal to 0.05, a $1 change in aggregate income or production induces a $0.05 change in government purchases. This positive slope indicates induced government purchases. Moreover, the slope of the line is also the marginal propensity for government purchases (MPG).
- Intercept: This new government purchases line, like the original line, intersects the vertical axis at a positive value of $2 trillion. And once again this indicates autonomous government purchases.
Recommended Citation:GOVERNMENT PURCHASES LINE, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2021. [Accessed: September 18, 2021].
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Today, you are likely to spend a great deal of time wandering around the downtown area looking to buy either a how-to book on home remodeling or a tall storage cabinet with five shelves and a secure lock. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
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"As the births of living creatures at first are ill-shapen, so are all innovations, which are the births of time. " -- Sir Francis Bacon, philosopher
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MSE
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