chap005-the household-consumption sector
DESCRIPTION
slavin economicsTRANSCRIPT
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Chapter 5
The Household-Consumption Sector
Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved. 5-1
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Chapter Objectives
• The average propensity to consume• The average propensity to save• The marginal propensity to consume• The marginal propensity to save• The consumption function• The saving function• The determinants of consumption• The permanent income hypothesis
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GDP and Big Numbers
• Gross Domestic Product (GDP) is the nation’s expenditures on all final goods and services produced during the year at market prices– GDP for 2002 was 10,446.2 billions of dollars
• This can be written as – $10,442,020,000,000
– $10,446.2 billion
– $10.5 trillion
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Four Parts of GDP
• Consumption ------------ C (this chapter)
• Investment ---------------- I (Chapter 6)
• Government -------------- G (Chapter 7)
• Net exports --------------- Xn (Chapter 8)
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Consumption
• Americans spend over 95% of their income after taxes– The total of everyone’s expenditures is called
consumption• Consumption is designated by the letter C
• C is the largest sector of GDP– Now C is just over two-thirds of GDP
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Consumption
• The consumption functions states– As income rises, consumption (C) rises, but
not as quickly– Therefore, consumption varies with
disposable income (DI)• DI increases . . . C increases but by a smaller
amount
• DI decreases . . . C decreases but by a smaller amount
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Consumption and Disposable Income
Disposable Income Consumption
1,000 1,400
2,000 2,200
3,000 3,000
4,000 3,800
5,000 4,600
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Consumption and Disposable Income
Disposable Income Consumption
1,000 1,400
2,000 2,200
3,000 3,000
4,000 3,800
5,000 4,600
+ 1000 + 800
+ 1000 + 800
+ 1000 + 800
+ 1000 + 800
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Saving
• Saving is NOT spending• The more we spend, the less we save• A low savings rate leads to a low
productivity growth rate– Without savings ($) to invest in NEW plant
and equipment, we cannot raise our productivity fast enough!
• Savings includes personal saving, business saving, and a government surplus (if they have one)
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Source: Economic Report of the President, 2006, Survey of Current Business, March 2006
Saving as a Percentage of Disposable Income
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Average Propensity to Consume (APC)
(The Percent of DI Spent)
APC = -----------------------------------Consumption
Disposable Income
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Disposable Income Consumption Saving
$40,000 $30,000
Table 2
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Table 2
Disposable Income Consumption Saving
$40,000 $30,000 $10,000
APC = ------------ = ------------ = ------ = .75 C 30000 3
DI 40000 4
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Table 2
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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Table 2
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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Table 3
Disposable Income Saving
$20,000 $1,500
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Table 3
Disposable Income Saving
$20,000 $1,500
Disposable Income Saving Consumption
$20,000 $1,500 $18,500
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Table 3
Disposable Income Saving
$20,000 $1,500
Disposable Income Saving Consumption
$20,000 $1,500 $18,500
APC = ------------ = ------------ = ------ = .925 C 18500 37
DI 20000 40
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Table 3
Disposable Income Saving
$20,000 $1,500
Disposable Income Saving Consumption
$20,000 $1,500 $18,500
APC = ------------ = ------------ = ------ = .925 C 18500 37
DI 20000 40
APS = ------------ = ------------ = ------ = .075 S 1500 3 DI 20000 40
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Table 3
Disposable Income Saving
$20,000 $1,500
Disposable Income Saving Consumption
$20,000 $1,500 $18,500
APC = ------------ = ------------ = ------ = .925 C 18500 37
DI 20000 40
APS = ------------ = ------------ = ------ = .075 S 1500 3 DI 20000 40
+
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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
+
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Household Saving as a Percentage of Disposable Income
2006 Forecast, OECD, The EconomistsThe Economists, Feb. 4, 2006
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Average Propensity to Consume2006 Forecast, OECD
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Marginal Propensityto Consume (MPC)
MPC = CHANGE in Consumption
CHANGE in Income
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Marginal Propensityto Consume (MPC)
Table 4Year DI C S
1998 $30000 $23000 $7000
1999 $40000 $31000 $9000
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Marginal Propensityto Consume (MPC)
Table 4Year DI C S
1998 $30000 $23000 $7000
1999 $40000 $31000 $9000
10000 8000 2000Change
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Table 4Year DI C S
1998 $30000 $23000 $7000
1999 $40000 $31000 $9000
10000 8000 2000Change
MPC =---------------- = ---------- = ------- = .8Change in C 8000 8
Change in DI 10000 10
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Table 4Year DI C S
1998 $30000 $23000 $7000
1999 $40000 $31000 $9000
10000 8000 2000Change
MPC =---------------- = ---------- = ------- = .8Change in C 8000 8
Change in DI 10000 10
MPS = -------------- = ---------- = -------- = .2Change in S 2000 2
Change in DI 10000 10
+
1.0
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Graphing the Consumption Function
If Consumption rose at the same rate as Disposable Income . . . A graph of this function would be a 45 % line
Disposable income ($)
45û
1,000
1,000
2,000
3,000
2,000 3,000
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Graphing the Consumption Function
Consumption is the vertical distance between the bottom (horizontal) axis and the “C” line.
DI C S
3000 1750
5-34
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
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Graphing the Consumption Function
DI C S
3000 1750 1250
5-35
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
Saving is the vertical distance between the “C” line and the 45 degree lineCopyright 2005 by The McGraw-Hill Companies, Inc. All rights reserved.
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440
5-36
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
Consumption is the vertical distance between the bottom (horizontal) axis and the “C” line.Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560
5-37
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
Saving is the vertical distance between the “C” line and the 45 degree lineCopyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000
5-38
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
Consumption is the vertical distance between the bottom (horizontal) axis and the “C” line.Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0
5-39
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
Saving is “0” at 1000 DI because there is NO distance between the C line and the 45 degree line.Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0 0 625
5-40
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
Consumption is the vertical distance between the bottom (horizontal) axis and the “C” line.Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0 0 625
5-41
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
When DI is “0” the level of Consumption is called Autonomous Consumption (AC)Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0 0 625 -625
5-42
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
Saving is the vertical distance between the “C” line and the 45 degree line. Saving is negative to the left of where the C line crosses the 45 degree line
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Autonomous Consumption versus Induced Consumption
• Autonomous consumption (AC) is the level of consumption when disposable income is “0”– It is called autonomous because it is independent of
change in disposable income
• Induced consumption (IC) is that part of consumption that varies with the level of disposable income– As disposable income rises, induced income rises– As disposable income fall, induced income falls
• IC = C - AC
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0 0 625 -625
5-44
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
DI = 0
What is IC?
IC = C - AC
IC = 625 - 625
IC = 0
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0 0 625 -625
5-45
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
DI = 1000
What is IC?
IC = C - AC
IC = 1000 - 625
IC = 375
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0 0 625 -625
5-46
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
DI = 2000
What is IC?
IC = C - AC
IC = 1440 - 625
IC = 815
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Graphing the Consumption Function
DI C S
3000 1750 1250 2000 1440 560 1000 1000 0 0 625 -625
5-47
Disposable income ($)
45û
C
1,000 2,000 3,0001,000
1,000
2,000
3,000
DI = 3000
What is IC?
IC = C - AC
IC = 1750 - 625
IC = 1125
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Consumer Spending ($ billions)
The major change in consumer spending has been a massive shift from nondurables to services
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Expenditures of the Average American Household, 2005
Bureau of Labor Statistics
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Determinants of the Level of Consumption
• Disposable Income– The most important determinant of consumption
• Credit Availability• Stock of Liquid Assets
– in the hands of consumers
• Stock of Durable Goods– in the hands of consumers
• Keeping up with the Jones's• Consumer Expectations
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Permanent Income Hypothesis(Milton Friedman)
• 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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The Determinants of Saving
• There is no single reason why people save• Some spend virtually all of their
disposable income• Some spend more than they earn• Americans now save less than 5 percent
of disposable income• Americans used to save 7 - 10 percent of
disposable income
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Why Do We Spend So Much and Save So Little?
• Americans have been on a spending binge the last 20 years– Mottos
• Buy now, pay later• Shop till you drop• We want it all, and we want it all
now!
5-54Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.
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• The Federal Government has underwritten America’s spending binge– Until 1987 interest paid on consumer loans was fully
deductible from income taxes• Mortgage interest and property taxes remain fully
deductible
– Credit cards, installment credit, and consumer loans have expanded tremendously
• 1990 – 2000 household debt doubled to $7 trillion
Why Do We Spend So Much and Save So Little?
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• Two factors have become increasingly important– Social Security causes many to NOT feel
a pressing need to save for their old age– Home ownership is seen as a form of
saving • Especially during a period of rising real
estate prices
Why Do We Spend So Much and Save So Little?
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Total Saving
• Every economy depends on saving for capital formation
• Individual saving + business saving + government saving = Total Saving– Declines in household saving has been offset
somewhat since 1993 by a sharp rise in government saving and business saving
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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
• 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
5-58Copyright 2008 by The McGraw-Hill Companies, Inc. All rights reserved.