The document provides an overview of supply and demand theory. It explains that supply and demand theory can be used to predict prices and quantities in a free market economy. The theory assumes that goods are traded in competitive markets with many buyers and sellers. Equilibrium occurs when the quantity demanded equals the quantity supplied at the market price. The law of demand states that quantity demanded varies inversely with price, while the law of supply states quantity supplied varies directly with price.
Determinants of demand
The demand for a product is influenced by a number of factors. Determinants of demand (also called factors affecting demand) are the factors which cause the demand curve to shift.
Determinants of demand
The demand for a product is influenced by a number of factors. Determinants of demand (also called factors affecting demand) are the factors which cause the demand curve to shift.
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2. We need to be able to predict the
consequences of
alternative policies, and
events that may be outside our control
The mental tool we use to make such
predictions is called a theory
A theory is of no use if its predictions are
inaccurate
SUPPLY AND DEMAND2
3. The theory of demand and supply is a simple
example of an economic theory
It can be used to make predictions about the
price and quantity of some commodity
In a free-market economy, most economic
decisions are guided by prices
Therefore, without a reliable theory of
prices, you will get nowhere in economic
analysis
SUPPLY AND DEMAND3
4. • The theory of supply and demand assumes that commodities are
traded in perfectly competitive markets
• A perfectly competitive market is a market in which
– there are many buyers
– many sellers
– and all sellers sell the exact same product
• As a result, each buyer and seller has a negligible impact on the
market price
SUPPLY AND DEMAND4
5. Quantity demanded is the amount of a
good that buyers are willing and able to
purchase
Demand is a full description of how the
quantity demanded changes as the price
of the good changes.
SUPPLY AND DEMAND5
8. The law of demand states that
the quantity demanded of a good falls when the
price of the good rises, and vice versa, provided
all other factors that affect buyers’ decisions are
unchanged
SUPPLY AND DEMAND8
9. That’s an important phrase in the wording of the Law of
Demand
The quantity demanded of a consumer good such as ice cream
depends on
The price of ice cream
The prices of related goods
Consumers’ incomes
Consumers’ tastes
Consumers’ expectations about future prices and incomes
Number of buyers, etc
The Law of Demand says that the quantity demanded of a
good is inversely related to its price, provided all other factors
are unchanged
SUPPLY AND DEMAND9
10. How can we explain the
difference in Catherine’s
behavior in situations A
and B?
Why does she consume
more in situation B at
every possible price?
SUPPLY AND DEMAND10
Quantity Demanded
Price Situation A Situation B
0.00 12 20
0.50 10 16
1.00 8 12
1.50 6 8
2.00 4 6
2.50 2 4
3.00 0 2
Price
Quantity Demanded
11. … are caused by changes in:
Consumer income
Prices of related goods
Tastes
Expectations, say, about future prices and
prospects
Number of buyers
SUPPLY AND DEMAND11
12. SUPPLY AND DEMAND12
Price of
Ice-Cream
Cone
Quantity of
Ice-Cream Cones
Increase
in demand
Decrease
in demand
Demand curve, D3
Demand
curve, D1
Demand
curve, D2
0
13. • Consumer Income
– As income increases the demand for a normal good will increase
– As income increases the demand for an inferior good will decrease
• Prices of Related Goods
– When a fall in the price of one good reduces the demand for another
good, the two goods are called substitutes
– When a fall in the price of one good increases the demand for another
good, the two goods are called complements
SUPPLY AND DEMAND13
14. There are two ways to explain the Law of
Demand
Substitution effect
Income effect
SUPPLY AND DEMAND14
15. When the price of a good
decreases, consumers substitute that good
instead of other competing (substitute) goods
SUPPLY AND DEMAND15
Coke Books MoviesClothes
1. When the price of Coke
decreases…
Pepsi
2. Consumption of
Pepsi decreases…
3. Consumption of
Coke increases
16. A decrease in the price of a commodity is
essentially equivalent to an increase in
consumers’ income
SUPPLY AND DEMAND16
17. Situation A
Price of an Apple $1.00
Price of an Orange $2.00
Income $10.00
Situation B
Price of an Apple $1.00
Price of an Orange $2.00
Income $20.00
Situation C
Price of an Apple $0.50
Price of an Orange $1.00
Income $10.00
SUPPLY AND DEMAND 17
If prices fall, Situation A
becomes Situation C.
If income rises, Situation A
becomes Situation B.
Q: Which change is better?
A: They are both equally
desirable. A fall in prices is
equivalent to an increase in
income.
18. Consumers respond to a decrease in the price of a
commodity as they would to an increase in income
They increase their consumption of a wide range of
goods, including the good that had a price decrease
SUPPLY AND DEMAND18
Coke Books MoviesClothes
1. When the price of Coke
decreases…
2. Consumers
feel richer…
3. Consumption of Coke and
other goods increases
Pepsi
19. Quantity supplied is the amount of a good that
sellers are willing and able to sell
Supply is a full description of how the quantity
supplied of a commodity responds to changes in
its price
SUPPLY AND DEMAND19
20. Ben’ssupplyscheduleandsupplycurve
20
Supply curve
Price of
Ice-cream cone
Quantity of
Cones supplied
$0.00
0.50
1.00
1.50
2.00
2.50
3.00
0 cones
0
1
2
3
4
5
0 1210 1191 2 3 4 5 6 7 8
Quantity of Ice-Cream Cones
$3.00
2.50
2.00
1.50
1.00
0.50
Price of
Ice-Cream
Cones
1. An increase
in price . . .
2. . . . increases quantity
of cones supplied.
23. The law of supply states that, the quantity
supplied of a good rises when the price of the
good rises, as long as all other factors that
affect suppliers’ decisions are unchanged
SUPPLY AND DEMAND23
24. How can we make sense of
the numbers in Ben’s supply
schedule?
The best guess is that his
costs must be something like
the cost schedule below.
A specific ice-
cream cone
It’s cost ($)
1st 0.75
2nd 1.35
3rd 1.75
4th 2.30
5th 2.85
6th 3.10SUPPLY AND DEMAND 24
In this way, the Law of Supply
follows from the assumption of
Increasing Costs (or, Diminishing
Returns)
25. SUPPLY AND DEMAND25
Price of
Ice-Cream
Cone
Quantity of
Ice-Cream Cones
0
Increase
in supply
Decrease
in supply
Supply curve, S 3
curve,
Supply
S 1
Supply
curve, S 2
26. How could Ben’s supply
have increased?
Ben’s Supply Schedule
Price ($) Quantity Supplied
Before After
0.00 0 0
0.50 0 1
1.00 1 2
1.50 2 3
2.00 3 4
2.50 4 5
3.00 5 6
Ice-cream
cone
It’s cost ($)
Before After
1st 0.75 0.45
2nd 1.35 0.85
3rd 1.75 1.45
4th 2.30 1.95
5th 2.85 2.45
6th 3.10 2.90
SUPPLY AND DEMAND 26
Anything that reduces
production costs, shifts
supply to the right.
27. … are caused by changes in
Input prices
Technology
Number of sellers (short run)
The market supply will shift right if
Raw materials or labor becomes cheaper
The technology becomes more efficient
Number of sellers increases
SUPPLY AND DEMAND27
28. We have seen what demand and supply are
We have seen why demand and supply may shift
Now it is time to say something about how buyers
and sellers collectively determine the market
outcome
To do this, we assume equilibrium
SUPPLY AND DEMAND28
29. At $2.00, the quantity demanded is
equal to the quantity supplied!
SUPPLY AND DEMAND29
Demand Schedule Supply Schedule
30. Equilibrium of supply and demand
30
Supply
0 1210 1191 2 3 4 5 6 7 8
Quantity of Ice-Cream Cones
$3.00
2.50
2.00
1.50
1.00
0.50
Price of
Ice-Cream
Cones
Equilibrium
Demand
Equilibrium
price
Equilibrium
quantity
31. SUPPLY AND DEMAND31
Price of
Ice-Cream
Cone
0
Supply
Demand
(a) Excess Supply
Quantity
demanded
Quantity
supplied
Surplus
Quantity of
Ice-Cream
Cones
4
$2.50
10
2.00
7
32. Surplus
When price exceeds equilibrium price, then
quantity supplied is greater than quantity
demanded
There is excess supply or a surplus
Suppliers will lower the price to increase sales, thereby
moving toward equilibrium
SUPPLY AND DEMAND32
33. SUPPLY AND DEMAND33
Price of
Ice-Cream
Cone
0 Quantity of
Ice-Cream
Cones
Supply
Demand
(b) Excess Demand
Quantity
supplied
Quantity
demanded
1.50
10
$2.00
74
Shortage
34. Shortage
When price is less than equilibrium price, then
quantity demanded exceeds the quantity supplied
There is excess demand or a shortage
Suppliers will raise the price due to too many buyers
chasing too few goods, thereby moving toward
equilibrium
SUPPLY AND DEMAND34
35. Law of supply and demand
The price of any good adjusts to bring the quantity supplied
and the quantity demanded for that good into balance
SUPPLY AND DEMAND35
37. SUPPLY AND DEMAND37
Price of
Ice-Cream
Cone
0 Quantity of
Ice-Cream Cones
Supply
Initial
equilibrium
D
D
3. . . . and a higher
quantity sold.
2. . . . resulting
in a higher
price . . .
1. Hot weather increases
the demand for ice cream . . .
2.00
7
New equilibrium$2.50
10
38. SUPPLY AND DEMAND38
Price of
Ice-Cream
Cone
0 Quantity of
Ice-Cream Cones
Demand
New
equilibrium
Initial equilibrium
S1
S2
2. . . . resulting
in a higher
price of ice
cream . . .
1. An increase in the
price of sugar reduces
the supply of ice cream. . .
3. . . . and a lower
quantity sold.
2.00
7
$2.50
4
39. Event Effect on Price Effect on Quantity
Demand increases Up Up
Supply decreases Up Down
Both Up Ambiguous
SUPPLY AND DEMAND39