
Today's Index
Yesterday's Index 300.0
Help us compile the AmosWEB Free Lunch Index. Tell us about your last lunch.
More About the Index



ZERO COUPON BOND: Also termed a zero bond, a bond that does not pay interest, in which the return is generated by the difference between the purchase price and the face value paid at maturity. Because they do not pay interest, zero coupon bonds are sold at a discount. For example, a $10,000 zero coupon bond that matures in one year, would generate a 10% return if it sold at a discount of $9,000.
Visit the GLOSS*arama




CONSUMPTION FUNCTION: A mathematical relation between consumption and income by the household sector. The consumption function can be stated as an equation, usually a simple linear equation, or as a diagram designated as the consumption line. This function captures the consumptionincome relation that forms one of the key building blocks for Keynesian economics. The two key parameters of the consumption function are the intercept term, which indicates autonomous consumption, and the slope, which is the marginal propensity to consume and indicates induced consumption. Aggregate expenditures used in Keynesian economics are derived by adding investment, government purchases, and net exports to the consumption function. The consumption function is the starting point in the Keynesian economics analysis of equilibrium output determination. It captures the fundamental psychological law put forth by John Maynard Keynes that consumption expenditures by the household sector depend on income and than only a portion of additional income is used for consumption.This function is presented either as a mathematical equation, most often as a simple linear equation, or as the graphical consumption line. In either form, consumption is measured by consumption expenditures and income is measured as disposable income, national income, or occasionally gross domestic product. The primary purpose of the consumption function the basic consumptionincome relation for the household sector, which is the foundation of the aggregate expenditures line used in Keynesian economics. The consumption function makes it easy to divide consumption into two basic types. Autonomous consumption is the intercept term. Induced consumption is the slope. Of no small importance, the slope of the consumption function is also the marginal propensity to consume (MPC). First, The EquationThe consumption function can represented in a general form as:where: C is consumption expenditures, Y is income (national or disposable), and f is the notation for a generic, unspecified functional form.Depending on the analysis, the actual functional form of the equation can be linear, with a constant slope, or curvilinear, with a changing slope. The most common form is linear, such as the one presented here: where: C is consumption expenditures, Y is income (national or disposable), a is the intercept, and b is the slope.The two key parameters that characterize the consumption function are slope and intercept.  Slope: The slope of the consumption function (b) measures the change in consumption resulting from a change in income. If income changes by $1, then consumption changes by $b. This slope is generally assumed and empirically documented to be greater than zero, but less than one (0 < b < 1). It is conceptually identified as induced consumption and the marginal propensity to consume (MPC).
 Intercept: The intercept of the consumption function (a) measures the amount of consumption undertaken if income is zero. If income is zero, then consumption is $a. The intercept is generally assumed and empirically documented to be positive (0 < a). It is conceptually identified as autonomous consumption.
Then, The GraphConsumption Line 

 The consumption function is also commonly presented as a diagram or consumption line, such as the one presented in the exhibit to the right. This red line, labeled C in the exhibit is positively sloped, indicating that greater levels of income generate greater consumption expenditures by the household sector. The specific consumption function illustrated in this exhibit is:For reference, a black 45degree line is also presented in this exhibit. Because this line has a slope of one, it indicates the relative slope of the consumption line. The two primary characteristics of the consumption functionslope and interceptalso can be identified with the consumption line.  Slope: The slope of the consumption line presented here is positive, but less than one. In this case the slope is equal to 0.75. Click the [Slope] button to highlight.
 Intercept: The consumption line intersects the vertical axis at a positive value of $1 trillion. Click the [Intercept] button to highlight.
And Other FactorsThe consumption function captures the relation between consumption and income. However, income is not the only factor influencing consumption. where: C is consumption expenditures, Y is income (national or disposable), and now OF is specified as other factors affecting consumption. These other factors, officially referred to as consumption expenditures determinants, include a range of influences. Some of the more notable consumption determinants are consumer confidence, interest rates, and wealth.Consumer confidence is the general optimism or pessimism the household sector has about the state of the economy. More optimism means more consumption. Interest rates affect the cost of borrowing the funds used to purchase durable goods. Higher interest rates mean less consumption. Wealth is the financial and physical assets owned by the household sector. More financial wealth means more consumption, while more physical assets mean less consumption. These determinants cause consumption expenditures to change even though income does not change. Or another way of stating this, determinants cause consumption expenditures to change at every level of income. For a linear consumption function, this change is reflected by a change in the intercept term (a). For a consumption line, the change is seen as an upward or downward shift.
Recommended Citation:CONSUMPTION FUNCTION, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 20002014. [Accessed: September 18, 2014]. Check Out These Related Terms...              Or For A Little Background...            And For Further Study...               
Search Again?
Back to the WEB*pedia



State of the ECONOMY
Construction Spending
July 2014
$981.3 billion
Up 1.1% from June 2014
More Stats


YELLOW CHIPPEROON [What's This?]
Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway wanting to buy either a case of blank recordable DVDs or a pair of red goulashes with shiny buckles. Be on the lookout for jovial bank tellers. Your Complete Scope
This isn't me! What am I?


Francis Bacon (15611626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.


"As the births of living creatures at first are illshapen, so are all innovations, which are the births of time. "  Sir Francis Bacon, philosopher


MRP Marginal Revenue Product


Tell us what you think about AmosWEB. Like what you see? Have suggestions for improvements? Let us know. Click the User Feedback link.
User Feedback

