Date post: | 12-Nov-2014 |
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Technology |
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Lecture 5Market Supply And Market Equilibrium
•Supply: Quantity Supplied and
Changes in Supply
•Demand and Supply Equilibrium
Supply
• If a firm supplies a good or service, the firm
–Has the resources and technology to produce it,
–Can profit from producing it, and
–Has made a definite plan to produce it and sell it.
What determines selling plans?
–The price of the good
–The prices of resources used to produce the good
–Technology
–The number of suppliers–The prices of related goods produced
–Expected future prices
•The relationship between the amount supplied of a good and the good’s price
Quantity Supplied
•The relationship between the amount supplied of a good and everything else
Changes in Supply
Supply
• The quantity supplied of a good or service is the amount that producers plan to sell during a given time period at a particular price.
• The Law of Supply
–Ceteris Paribus, the higher the price of a good, the greater is the quantity supplied;
And Vice Versa
• Increasing marginal (opportunity) cost
(recall lecture 2)
WHY?
The Reason for the Law
CDs (millions per month)0 1 2 3 4 5
1
2
3
4
5MC
Marginal Cost
Pri
ce (
doll
ar p
er C
D)
Supply Schedule and Supply Curve
Supply schedules list the quantities supplied at alternative prices
Supply curves are graphs of supply schedules
Supply Schedule
a 1 0
b 2 3
c 3 4
d 4 5
e 5 6
Price Quantity (dollars per CD) (millions of CDs per week)
Supply Curve
0 2 4 6 8 10
1
2
3
4
5
6Supply of CDs
a
b
c
d
e
CDs (millions per month)
Pri
ce (
doll
ar p
er C
D)
A Price Increase
Quantity
Pri
ce S0
P0
P1
Q0Q1
Supply
• A Change in Supply
–When any factor that influences selling plans changes, other than the price of the good, there is a
change in supply.
Demand
An increase in supply causes
the supply curve to
SHIFT RIGHTWARD
Pri
ce
Quantity
S0 S1
Increase in
supply
Demand
A decrease in supply causes
the supply curve to
SHIFT LEFTWARD
Pri
ce
Quantity
S0S2
Decrease in Supply
Changes in Supply Are Caused by
–The prices of resources used to produce the good
–Technology
–The number of suppliers–The prices of related goods produced
–Expected future prices
• Price of Productive Resources --
higher or lower?
• Technology -- better or worse?
• The Number of Suppliers -- more or fewer?
Consider the First 3 and anIncrease in Supply
• Price of Productive Resources -- lower!
• Technology -- better!
• The Number of Suppliers -- more!
Increase in Supply
Pri
ce
Quantity
S0 S1
Increase in
supply
• Price of Related Goods Produced
–Complements in Production
If the price of leather increases, what happens to the Supply of
beef?
Pri
ce
Quantity
S0 S1
Increase in
supply
Supply of Beef?
• Price of Related Goods Produced
–Substitutes in Production
If the price of shirts increases, what
happens to the supply of Dresses?
Pri
ce
Quantity
S0S2
Decrease in Supply
A Change in SupplyWHICH LEAVES….
Expected Future Prices
A Change in Supply
COLD WEATHER:
significantly reduces Florida orange crop
Concentrated Orange juice stored to take advantage of higher future price.
Pri
ce
Quantity
S0S2
Decrease in Supply
Market Equilibrium
Having Now Considered Demand and Supply
Put them together to consider
Market Equilibrium
Market Equilibrium
• Equilibrium price: price at which quantity demanded equals quantity supplied.
• Equilibrium quantity: quantity bought and sold at the equilibrium price.
Market Equilibrium at the intersection of demand & supply curves
0 2 4 6 8 10
1
2
3
4
5
6Supply of CDs
Demand for CDs
CDs (millions per month)
Pri
ce (
doll
ar p
er C
D)
• Shortages and Surpluses generate the pressures for the emergence of the equilibrium price– price too low creates a
Shortage: price will be forced up
– price too high creates a
Surplus: price will be forced down
Market Equilibrium
0 2 3 4 6 8 10
1
2
3
4
5
6
shortage
Supply of CDs
Demand for CDs
CDs (millions per month)
Pri
ce (
doll
ar p
er C
D)
Market Equilibrium
0 2 3 4 5 6 8 10
1
2
3
4
5
6
surplusSupply of CDs
Demand for CDs
CDs (millions per month)
Pri
ce (
doll
ar p
er C
D)
How Does Equilibrium ChangeWhen Demand and Supply change
There are 8 Combinations of Changes
Rule 1: Compare the initial equilibrium point to the new one!
Rule 2: Analytical tools are your friends, USE THEM!
•What happens to price and quantity?
Example
Supply decreases and demand decreases
What happens to price and quantity?
The Effects of a Decrease in Both Demand and Supply
Quantity (millions of ? per week)0 2 4 6 8 10 12 14
1
2
3
4
5
6P
rice
(do
llar
per
?)
Price Constant?
Quantity Falls
Not Necessarily
The Effects of a Decrease in Both Demand and Supply
Quantity (millions of ? per week)0 2 4 6 8 10 12 14
1
2
3
4
5
6P
rice
(do
llar
per
?)