the household- consumption sector chapter 05 copyright © 2011 by the mcgraw-hill companies, inc....
TRANSCRIPT
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The Household-Consumption Sector
Chapter 05
Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin
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Learning Objectives
After this chapter, you should be able to:1. Define and compute the average propensity to consume and
the average propensity to save.2. Define and compute the marginal propensity to consume and
the marginal propensity to save.3. Explain the consumption function.4. Explain the savings function.5. Calculate autonomous and induced consumption.6. List and discuss the determinants of consumption.7. Interpret and assess the permanent income hypothesis.8. Explain why we spend so much and save so little.
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GDP and Big Numbers
Gross Domestic Product (GDP) is the nation’s expenditure on all final goods and services produced during the year at market prices.
Consumption, investment, and government spending are the three main sectors of GDP.
GDP for 2009 was $14.2 trillion. • This can be written as
$14,200,000,000,000 $14,200 billion $14.2 trillion
• Consumption by households was $10.089 trillion in 2009. 10 trillion, 89 billion dollars
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Four Parts of GDP
Consumption ------------ C (this chapter)• Consumption includes spending on consumer goods and
services.
Investment ---------------- I (Chapter 6)• Investment includes business investments in capital and
inventories, as well as residential investment by households.
Government -------------- G (Chapter 7)• Government spending on goods and services.
Net exports --------------- Xn (Chapter 8)• Exports minus imports.
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Consumption
C is the largest sector of GDP.• C now accounts for 7 out of every 10 dollars spent on final goods
and services.
Americans spend virtually all of their income after taxes, although savings have increased slightly since 2007.
• Consumers spend 67.7 percent of their disposable income on services such as medical care, gasoline, eating out, video rentals, life insurance, and legal fees.
• The rest is spent on durable goods, such as television sets and furniture, or on nondurable goods, such as food and gasoline.
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Consumption Function
A function specifies a relationship between two variables.• C varies with the level of after-tax income. • John Maynard Keynes noted that consumption was a stable
component of income.
The consumption function states that• As income rises, consumption (C) rises, but not as quickly.• Therefore, consumption varies with disposable income (DI).
DI increases . . . C increases but by a smaller amount. DI decreases . . . C decreases but by a smaller amount.
We will look at the mathematical relationships behind this function and then graph it.
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Example: Consumption and Disposable Income
(in billions of dollars)
Disposable Income Consumption
1,000 1,400
2,000 2,200
3,000 3,000
4,000 3,800
5,000 4,600
Note that C > DI at very low income levels.
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Consumption and Disposable Income
Disposable Income Consumption
1,000 1,400
2,000 2,200
3,000 3,000
4,000 3,800
5,000 4,600
+ 1000 + 800
+ 1000 + 800
+ 1000 + 800
+ 1000 + 800
Each time DI increases by $1,000, C increases by $800.
+ 1000 + 800
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Saving
Saving is defined as NOT spending.• DI – C = S • The more we spend, the less we save.
A low savings rate leads to a low productivity growth rate.
• Without savings ($) to invest in NEW plant and equipment, we cannot raise our productivity fast enough!
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Source: Economic Report of the President, 2010, Survey of Current Business, March 2010
Saving as a Percentage of Disposable Income
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Household Saving as a Percentage of Disposable
Income in 2009
The U.S. saving rate is low compared with other developed economies. Source: OECD
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Questions for Thought and Discussion
Americans spend more on services than on durable and non-durable goods. Give an example of each category from your own spending habits.
How is it possible to consume more than your income?
If a country has a negative saving rate, does that mean that nobody in the country is saving?
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Four Concepts
Average Propensity to Consume: the percentage of disposable income that is spent
Average Propensity to Save: the percentage of income that is saved
• APC + APS = 100% of DI or 1.00 in decimal form
Marginal Propensity to Consume: the percentage of an increase in disposable income that is spent
• change in C divided by change in DI
Marginal Propensity to Save: the percentage of an increase in disposable income that is saved
• change in S divided by change in DI • MPC + MPS = 1.00 in decimal form
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Average Propensity to Consume (APC) (The Percent of DI Spent)
APC =Consumption
Disposable Income
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APC values and their meaning
The APC may = 1 signifying all disposable income is consumed.
The APC may be > 1 signifying you are consuming more than your disposable income by dipping into your savings.
The APC may be < 1 indicating you’re a saving a portion of your disposable income.
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Sample APC Problem
Disposable Income Consumption Saving
$40,000 $30,000 $10,000
APC = = = = .75 C 30000 3
DI 40000 4
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Disposable Income Consumption Saving
$40,000 $30,000
Sample APC Problem
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Sample APC Problem
Disposable Income Consumption Saving
$40,000 $30,000 $10,000
APC = = = = .75 C 30000 3
DI 40000 4
APS = = = = .25 S 10000 1
DI 40000 4
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Sample APC Problem
Disposable Income Consumption Saving
$40,000 $30,000 $10,000
APC = = = = .75 C 30000 3
DI 40000 4
APS = = = = .25 S 10000 1
DI 40000 4
+
1.0
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APCs Greater Than One
Disposable Income Consumption Saving
$10,000 $12,000
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APCs Greater Than One
Disposable Income Consumption Saving
$10,000 $12,000 – 2000
Where is this going to come from?
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APCs Greater Than One
Disposable Income Consumption Saving
$10,000 $12,000 – 2000
APC = = = = 1.2 C $12,000 12
DI $10,000 10
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APCs Greater Than One
Disposable Income Consumption Saving
$10,000 $12,000 – 2000
APC = = = = 1.2 C $12,000 12
DI $10,000 10
APS = = = –0.2 S -$2,000 -2
DI $10,000 10
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APCs Greater Than One
Disposable Income Consumption Saving
$10,000 $12,000 – 2000
APC = = = = 1.2 C $12,000 12
DI $10,000 10
APS = = = = –0.2 S -$2,000 -2
DI $10,000 10
+
1.0
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Average Propensity to Consume, Selected Countries, 2009
Source: OECD
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Marginal Propensity to Consume (MPC)
MPC =
CHANGE in C
CHANGE in DI
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Calculate MPC Using Hypothetical Data
Year DI C S
2000 $30,000 $23,000 $7,000
2001 $40,000 $31,000 $9,000
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Calculating MPC
Change in DI = 40,000 – 30,000 = $10,000
Change in C = 31,000 – 23,000 = $8,000
Change in C = 8,000/10,000 = .8
Change in DI
The MPC is .8
This country consumes 80% of each increase in disposable income.
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Calculating MPS
Change in DI = 40,000 - 30,000 = $10,000
Change in S = 9,000 – 7,000 = $2,000
Change in S = 2,000/10,000 = .2
Change in DI
MPS = .2
This country saves 20% of each increase in DI.
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Graphing the Consumption Function: The 45- Degree Line
Notice that the scales of the vertical and horizontal axes are the same.
At each point along the 45-degree line, the measurement on the two axes is the same.
The line represents every point where Expenditures equal Disposable Income.
Example: On the 45-degree line, when DI = 2,000, what does Expenditures equal?
Answer: 2,000 Consumption is one category
of expenditures, so start by graphing C.
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Graphing the Consumption Function
Consumption is the vertical distance between the bottom (horizontal) axis and the “C” line.
If DI = $3 trillion, how much is C?
• This is where the C function crosses the 45-degree line.
• C = DI = $3 trillion
If DI is $6 trillion, C will be $4.5 trillion.
If DI is $1 trillion, C is $2 trillion. Some of the C is financed by borrowing (Example: Denmark).
Can you use these numbers to calculate APC and MPC?
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The Saving Function
This graph uses the same data as the Consumption Function.
S = DI C. Can you calculate APS and
APC?
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Autonomous Consumption vs. Induced Consumption
Autonomous consumption (AC) is the level of consumption when disposable income is “0”.
• It is called autonomous because it is independent of change in disposable income.
• AC = $2 trillion on graph Induced consumption (IC) is
that part of consumption that varies with the level of disposable income.
• As disposable income rises, induced income rises.
• As disposable income fall, induced income falls.
IC = C – AC for each level of DI
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Questions for Thought and Discussion
What does the 45-degree line represent? Discuss the important features of the consumption function in relation to this line.
How many values for C and DI do you need to calculate the APC? How many values for C and DI do you need to calculate the MPC? Explain the difference.
Why does the consumption function have a positive
slope?
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Consumer Spending, 1955 and 2009 ($billions)
The major change in consumer spending has been a massive shift from nondurables to services.
Source: Survey of Current Business, 2010.
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Expenditures of the Average American Household, 2009 Bureau of Labor Statistics
Source: www.bea.gov
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Consumption as a Percentage of GDP1980 - 2010
Between 1982 and early 2008, there was a steady upward trend.
Source: www.bea.gov Source: www.bea.gov
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Determinants of the Level of Consumption
1. Disposable Income• The most important determinant of consumption.
2. Credit Availability• Ability to borrow affects spending.• Decrease in home equity loans since 2006 has cut C.
3. Stock of Liquid Assets in the hands of consumers• Stocks, bonds, savings accounts, CDs, money market funds
4. Stock of Durable Goods in the hands of consumers• Market saturation leads to drop in C.
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Determinants of the Level of Consumption (Continued)
5. Keeping up with the Jones's• Veblen’s theory of conspicuous consumption• Consuming things adds to our social status.
6. Maintaining a basic standard of living• Social definition of basic standard of living changes over time.• The bar keeps rising. • Two-income trap?
7. Consumer Expectations• Buy now if expect prices to rise.• Buy later if expect prices to fall in recession.
8. The Wealth Effect • When the value of your home or stocks increases, you feel
wealthier and spend more. • Fall in housing prices led to falling C.
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Permanent Income Hypothesis
Idea proposed by Milton Friedman, a prominent conservative economist in the late 20th century.
People gear their consumption to their expected lifetime average earnings more than to their current income.
• Apparently there are quite a few deviations from the behavior predicted by the permanent income hypothesis.
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Americans have been on a spending binge for the last 30 years.
• Government policies encouraged consumption: Mortgage interest and property taxes are tax-deductable.
• The tremendous expansion of bank credit cards, installment credit, and consumer loans has further fueled the consumer binge.
Savings as Percentage of GDP, 1959-2009
Why Do We Spend So Much and Save So Little?
Source: Survey of Current Business, March 2010.
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Why does it matter?
Every economy depends on saving for capital formation. Individual saving + business saving + government saving
= Total Saving• Until the recession of 1981–82, as a nation we generally saved
about 20 percent of U.S. GDP. • Declines in household saving has been offset somewhat from
1993 – 2000 by a sharp rise in government saving and business saving.
• Since 2001, government savings have declined.
Since Americans were not saving enough, we have needed to borrow almost $2 billion a day from foreigners.
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Current Issue: The American Consumer: World Class Shopper
The consumer is the prime mover of our economy and increasingly, that of the world economy as well.
The American consumer made the Japanese recovery possible after World War II.
The American consumer has made China’s economic growth of about 10% over the last 20 years possible.
The negative aspect of this is our tremendous trade deficits with much of the rest of the world.
Private Consumption as a Percentageof GDP, Selected Countries, 2008
Sources: CEIC; OECD; World Bank.Sources: CEIC; OECD; World Bank.
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Questions for Thought and Discussion
What motivates consumption and what do Americans spend their money on?
How have American savings rates changed overtime? What would be the consequences of present trends continuing?