Individual Markets: •Demand & Supply 3 C H A P T E R
Dec 26, 2015
Individual Markets:
• Demand & Supply
3C H A P T E R
MARKETS DEFINED
MARKETS
POTENTIALSELLERS
POTENTIALBUYERS
$54321
DEMAND DEFINED
DEMAND SCHEDULEDEMAND SCHEDULE
Various AmountsVarious Amounts
A Series of Possible PricesA Series of Possible Prices
…a specified time period…other things being equal
P QD
1020355580
LAW OF DEMAND
• As Price Falls…
…Quantity Demanded Rises
• As Price Rises…
…Quantity Demanded Falls
An inverse relationship exists between price and quantity demanded
• Diminishing Marginal Utility
• Income Effect
• Substitution Effect
LAW OF DEMAND
• Demand Curve
• Individual and Market Demand
GRAPHING DEMANDP
Qo
$5
4
3
2
1
P QD
$54321
1020355580
Price of Corn
Quantity of Corn
CORN Plot the Points
10 20 30 40 50 60 70 80
P
Qo
$5
4
3
2
1
P QD
$54321
1020355580
Price of Corn
Quantity of Corn
CORN Plot the Points
10 20 30 40 50 60 70 80
GRAPHING DEMAND
P
Qo
$5
4
3
2
1
P QD
$54321
1020355580
D
Price of Corn
Quantity of Corn
CORN
10 20 30 40 50 60 70 80
What if
Demand
Increases?
GRAPHING DEMAND
P
Qo
$5
4
3
2
1
P QD
$54321
D
Price of Corn
Quantity of Corn
CORN
10 20 30 40 50 60 70 80
D’
Increase
in
Demand
Increase
in Quantity
Demanded1020355580
30406080 +
GRAPHING DEMAND
P
Qo
$5
4
3
2
1
P QD
$54321
1020355580
D
Price of Corn
Quantity of Corn
CORN
10 20 30 40 50 60 70 80
What if
Demand
Decreases?
GRAPHING DEMAND
P
Qo
$5
4
3
2
1
P QD
$54321
1020355580
D
Price of Corn
Quantity of Corn
CORN
10 20 30 40 50 60 70 80
-- 10204060
D’
Decrease
in
Demand
Decrease
in Quantity
Demanded
GRAPHING DEMAND
DETERMINANTS OF DEMAND
• Tastes• Number of Buyers• Income
– Normal (Superior) & Inferior Goods
• Prices of Related Goods– Substitutes & Complements– Unrelated Goods
• Expectations
SUPPLY DEFINED
SUPPLY SCHEDULESUPPLY SCHEDULE
$12345
P QS
CORN
Various AmountsVarious Amounts
A Series of Possible PricesA Series of Possible Prices
…a specified time period…other things being equal
520355060
LAW OF SUPPLY
• As Price Rises…
…Quantity Supplied Rises
• As Price Falls…
…Quantity Supplied Falls
A direct relationship exists between price and quantity supplied
P
Qo
$5
4
3
2
1
10 20 30 40 50 60 70 80
$54321
60503520 5
P QS
Price of Corn
Quantity of Corn
CORN
Plot the PointsGRAPHING SUPPLY
SP
Qo
$5
4
3
2
1
10 20 30 40 50 60 70 80
$54321
60503520 5
P QS
Price of Corn
Quantity of Corn
CORN
What if
Supply
Increases?
GRAPHING SUPPLY
SP
Qo
$5
4
3
2
1
10 20 30 40 50 60 70 80
Price of Corn
Quantity of Corn
$54321
60503520 5
P QS
CORN
8070604530
S’Increase
in
Supply
Increase
in Quantity
Supplied
GRAPHING SUPPLY
SP
Qo
$5
4
3
2
1
10 20 30 40 50 60 70 80
$54321
60503520 5
P QS
Price of Corn
Quantity of Corn
CORN
What if
Supply
Decreases?
GRAPHING SUPPLY
SP
Qo
$5
4
3
2
1
10 20 30 40 50 60 70 80
$54321
60503520 5
P QS
Price of Corn
Quantity of Corn
CORN
S’
453020 0 --
Decrease
in
Supply
Decrease
in Quantity
Supplied
GRAPHING SUPPLY
DETERMINANTS OF SUPPLY
• Resource Prices
• Technology
• Taxes & Subsidies
• Prices of Other Goods
• Price Expectations
• Number of Sellers
DETERMINANTS OF SUPPLY
• Resource Prices
• Technology
• Taxes & Subsidies
• Prices of Other Goods
• Price Expectations
• Number of Sellers
Combining
with
Demand
MARKET DEMAND & SUPPLY
$54321
1020355580
$54321
60503520 5
200
B
U
Y
E
R
S
P QD
BUSHELS
OF CORNMARKET
DEMAND
2,0004,0007,000
11,00016,000
200
S
E
L
L
E
R
S
12,00010,000
7,0004,0001,000
P QS
BUSHELS
OF CORNMARKET
SUPPLY
EQUILIBRIUMGraphically…
x x
7
SP
Qo
$5
4
3
2
1
2 4 6 8 10 12 14 16
P QD
$54321
2,0004,0007,000
11,00016,000
$54321
12,00010,000
7,0004,0001,000
D
P QS
Price of Corn
Quantity of Corn
CORN
MARKET
CORN
MARKET
Market Clearing Equilibrium
MARKET DEMAND & SUPPLY
7
SP
Qo
$5
4
3
2
1
2 4 6 8 10 12 14 16
P QD
$54321
2,0004,0007,000
11,00016,000
$54321
12,00010,000
7,0004,0001,000
D
P QS
Price of Corn
Quantity of Corn
CORN
MARKET
CORN
MARKETSurplusAt a $4 price
more is being
supplied than
demanded
MARKET DEMAND & SUPPLY
117
SP
Qo
$5
4
3
2
1
2 4 6 8 10 12 14 16
P QD
$54321
2,0004,0007,000
11,00016,000
$54321
12,00010,000
7,0004,0001,000
D
P QS
Price of Corn
Quantity of Corn
CORN
MARKET
CORN
MARKET
At a $2 price
more is being
demanded than
supplied
Shortage
MARKET DEMAND & SUPPLY
117
SP
Qo
$5
4
3
2
1
2 4 6 8 10 12 14 16
P QD
$54321
2,0004,0007,000
11,00016,000
$54321
12,00010,000
7,0004,0001,000
D
P QS
Price of Corn
Quantity of Corn
CORN
MARKET
CORN
MARKET
Shortage
MARKET DEMAND & SUPPLY Surplus