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COMMODITY EXCHANGE: A financial market that trades the ownership of various commodities, such as wheat, corn, cotton, sugar, crude oil, natural gas, gold, silver, and aluminum. The two biggest commodity exchanges in good old U. S. of A. are the Chicago Board of Trade and the Chicago Mercantile Exchange. Unlike, let's say a grocery store where commodities physically trade hands, commodity exchanges trade only legal ownership. This is much like a stock market, which trades the ownership of a corporation, but leaves the factory at home. Commodity markets offer two basic sorts of trading -- spot (immediate delivery of a commodity) and futures (delivery of a commodity at a future date).
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                           SLOPE, AGGREGATE EXPENDITURES LINE: The positive slope of the aggregate expenditures line is the sum of the marginal propensity to consume (MPC), marginal propensity to invest (MPI), and marginal propensity for government purchases (MPG), less the marginal propensity to import (MPM). This slope is greater than zero but less than one, reflecting induced expenditures by the four macroeconomic sectors (household, business, government, and foreign). The slope of the aggregate expenditures line determines the magnitude of the multiplier process. | Aggregate Expenditures Line | 
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The aggregate expenditures line, which embodies the key Keynesian principle of effective demand, shows the relation between aggregate expenditures and the actual level of aggregate income or production in the domestic economy. The income and production measures commonly used are national income and gross domestic product.The two basic types of expenditures--induced and autonomous--are indicated by the aggregate expenditures line. - Induced expenditures are the slope of the aggregate expenditures line. The marginal propensity to consume (MPC), which is the slope of the consumption line, forms the foundation of the slope of the aggregate expenditures line. This slope, however, is augmented by the marginal propensity to invest (MPI), marginal propensity for government purchases (MPG), and marginal propensity to import (MPM).
- Autonomous expenditures are the vertical intercept, or Y-intercept, of the aggregate expenditures line. This is the sum of autonomous consumption, autonomous investment, autonomous government purchases, and autonomous net exports, with an adjustment for autonomous taxes.
A representative aggregate expenditures line is presented in the exhibit to the right. This red line, labeled AE in the exhibit, is positively sloped, indicating that greater levels of income generate greater aggregate expenditures by the four sector. This positive relation is primarily based on the Keynesian psychological law indicating that consumption expenditures are induced by household income. However, this positive slope is reinforced and augmented by induce investment, government purchases, and net exports.The slope of the aggregate expenditures line presented here is positive, but less than one. Click the [Slope] button to illustrate. In fact, the slope of the aggregate expenditures line is numerically based on the marginal expenditure propensities for any of the induced expenditures included in the aggregate expenditures line. For a "complete" four-sector aggregate expenditures line, the slope is equal to the sum of the marginal propensity to consume (MPC), marginal propensity to invest (MPI), and marginal propensity for government purchases (MPG), less the marginal propensity to import (MPM). If induced taxes are also included, then the slope is adjusted for the marginal tax rate. To illustrate the connection between slope and the marginal expenditure propensities, consider the equation for the slope of the aggregate expenditures line, specified as the "rise" over the "run." The rise is the change in aggregate expenditures measured on the vertical axis and the run is the change in income (or production) measured on the horizontal axis. | slope | = | rise
run | = | change in aggregate expenditures
change in income |
However, for any induced movement on the aggregate expenditures line, the change in aggregate expenditures includes changes in consumption expenditures, investment expenditures, government purchases, or net exports. The slope of the aggregate expenditures line can thus be specified as based on each of these expenditures.| slope | = | change in (consumption + investment + government purchases + net exports)
change in income |
This can be rewritten as:| slope | = | change in
consumption
change in
income | + | change in
investment
change in
income | + | change in
government purchases
change in
income | + | change in
net exports
change in
income |
Because the induced change in net exports is attributable totally to the induced change in imports and because imports are subtracted for exports to derive net exports, the change in net exports is equal to the negative change in imports. The slope can be rewritten as:| slope | = | change in
consumption
change in
income | + | change in
investment
change in
income | + | change in
government purchases
change in
income | - | change in
imports
change in
income |
Each of these terms is a corresponding marginal propensity.| slope | = | marginal propensity
to consume | + | marginal propensity
to invest | + | marginal propensity
for government purchases | - | marginal propensity
to import |
Or, using standard abbreviations that are both symbolic and a little easier to remember.Because each of these marginals is the slope of the corresponding expenditure line (consumption line, investment line, government purchases line, and net exports line), the slope of the aggregate expenditures line is the summation of the slopes of the lines for each of the four aggregate expenditures.The positive slope of the aggregate expenditures line reflects induced expenditures, which are aggregate expenditures that depend on the level of income or production. If the aggregate economy has more income, then the four macroeconomic sectors are induced to undertake additional expenditures. Of course, a drop in aggregate income or production induces the sectors to reduce expenditures.
Recommended Citation:SLOPE, AGGREGATE EXPENDITURES LINE, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: June 8, 2026].
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GREEN LOGIGUIN
[What's This?]
Today, you are likely to spend a great deal of time at an auction seeking to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for high interest rates.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
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"Never confuse a single defeat with a final defeat." -- F. Scott Fitzgerald, writer
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AVT
Ad Valorem Taxes
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