Post on 12-May-2015
21 - 1Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
Consumer Behavior andUtility Maximization
21C H A P T E R
21 - 2Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
THE LAW OF DEMANDA Closer Look…
The Income Effect A lower price frees income for additional purchases - and vice versa
The Substitution Effect A lower price relative to other goods attracts new buyers - and vice versa
21 - 3Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
01
010
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
21 - 4Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
01
010 10
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
21 - 5Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
012
01018
10 8
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
21 - 6Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
0123
0101824
10 8 6
0 1 2 3 4 5 6 7
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
1 2 3 4 5 6 7
21 - 7Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
01234
010182428
10 8 6 4 Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
21 - 8Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
012345
01018242830
10 8 6 4 2
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
21 - 9Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
0123456
0101824283030
10 8 6 4 2 0
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
21 - 10Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
01234567
010182428303028
10 8 6 4 2 0 -2
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
TU
MU
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
21 - 11Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
TOTAL AND MARGINAL UTILITYTacos
consumedper meal
TotalUtility,Utils
MarginalUtility,Utils
01234567
010182428303028
10 8 6 4 2 0 -2
Units consumed per meal
Units consumed per meal
30
20
10
To
tal
Uti
lity
(u
tils
)M
arg
ina
l U
tili
ty (
uti
ls)
10 8 6 4 2 0 -2
TU
MU
0 1 2 3 4 5 6 7
1 2 3 4 5 6 7
ObserveDiminishing
MarginalUtility
21 - 12Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
THEORY OF CONSUMER BEHAVIOR
Consumer Choice and Budget Constraint• Subject to a Budget
Constraint
21 - 13Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
THEORY OF CONSUMER BEHAVIOR
Utility Maximizing Rule
The consumer’s money income should be allocated so that the last dollar spent on each product yields the same amount of extra (marginal) utility.
Illustrated...
21 - 14Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12
$ 10 income
UTILITY MAXIMIZING COMBINATION
How should the $10 income be allocated?
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 15Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12
$ 10 income
UTILITY MAXIMIZING COMBINATION
Examine the twomarginal utilities
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 16Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12
$ 10 income
UTILITY MAXIMIZING COMBINATION
Examine the twomarginal utilities
…per dollar
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 17Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12
$ 10 income
UTILITY MAXIMIZING COMBINATION
Decision: Buy 1Product B for $2
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 18Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
What next?
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 19Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
What next?Buy one of each
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 20Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
and then...($5 left)
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 21Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
third unit of product B
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 22Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
$3 left...
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 23Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
$3 left...Buy both!
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 24Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Income is gone...the last dollar spent on
each good gave the sameutility (8) per dollar
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
21 - 25Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
Algebraic Restatement of theUtility Maximization Rule
MU of product A
Price of A
MU of product B
Price of B=
UTILITY MAXIMIZING COMBINATION
8 Utils
$1
16 Utils
$2=
21 - 26Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
UTILITY MAXIMIZATION ANDTHE DEMAND CURVE
Deriving the Demand Schedule and Curve
21 - 27Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
UTILITY MAXIMIZATION ANDTHE DEMAND CURVE
Create a demand schedule from thepurchase decisions as the price of the product is varied ...
Price per unit of B Quantity Demanded
$2 4 1 6
Graphically…
Deriving the Demand Schedule and Curve
21 - 28Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
UTILITY MAXIMIZATION ANDTHE DEMAND CURVE
Deriving the Demand Schedule and Curve
Quantity Demanded of Good B
Pri
ce p
er u
nit
of
Goo
d B $2
1
0 4 6
DB
21 - 29Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
UTILITY MAXIMIZATION ANDTHE DEMAND CURVE
Deriving the Demand Schedule and Curve
Quantity Demanded of Good B
Pri
ce p
er u
nit
of
Goo
d B $2
1
0 4 6
DB
Income andSubstitution Effects
Revisited
21 - 30Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
APPLICATIONS AND EXTENSIONS
Vending MachinesThe Diamond-Water
Paradox
income effectsubstitution effectutilitytotal utilitymarginal utilitylaw of diminishing marginal utilityrational behaviorbudget constraintutility-maximizing rule
ENDBACKCopyright McGraw-Hill/Irwin, Inc. 2005
21 - 32Copyright McGraw-Hill/Irwin, 2005
The Law of Demand
Law of Diminishing Marginal Utility
Total and Marginal Utility
Theory of Consumer Behavior
Utility Maximizing Combination
Utility Maximization and the Demand Curve
Applications and Extensions
Key Terms
PreviousSlide
NextSlide
EndEndShowShow
Next…
Indifference Curve Analysis