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Assumptions, Individual Demand
& Market Demand
Presented by,
Ligin Joseph
Rohith K R
P R Karthik
Kuriakose T D
Steema Tomy
Sreekutty K A
Seethal Sam
Anju Thomas
Law of Demand
 Law of demand  there is an inverse relationship
between price and quantity demanded.
-Quantity demanded rises as price falls, other things constant.
-Quantity demanded falls as prices rise, other things constant.
 What accounts for the law of demand?
People tend to substitute for goods whose price has gone up.
Assumptions of Law of Demand
 No change in price of related commodities.
 No change in income of the consumer.
 No change in taste and preferences, customs, habit
and fashion of the consumers.
 No change in size of population.
 No expectation regarding future change in price.
Individual Demand
The individual demand is the demand of
one individual or firm. It represents the
quantity of a good that a single consumer
would buy at a specific price point at a
specific point in time.
Individual Demand Schedule & Curve
Price per Apple Adams Demand
30 3
25 6
20 9
15 12
10 15
MARKET DEMAND
 Market demand is the aggregate of individual demands of
a homogeneous commodity
 A market demand curve is the horizontal sum of all
individual demand curves.
 This is determined by adding the individual demand
curves of all the demanders.
 Sellers estimate total market demand for their product
which becomes smooth and downward sloping curve.
MARKET DEMAND FUNCTION
 The market demand function is the horizontal
summation of the individuals' demand functions.
From Individual Demands
to a Market Demand Curve
(1)
Price
per X
Rs.0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
(2)
As
demand
(3)
Bs
demand
(2)
Cs
demand
(3)
Market
demand
9
8
7
6
5
4
3
2
6
5
4
3
2
1
0
0
1
1
0
0
0
0
0
0
16
14
11
9
7
5
3
2
A
B
C
D
E
F
G
H
C B A
D
A
C
E
F
G
Quantity of X demanded per week
2
Rs4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0
PriceperX(inRs
4 6 8 10 12 14 16
B
Market demand
Law of demand

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Law of demand

  • 2. Presented by, Ligin Joseph Rohith K R P R Karthik Kuriakose T D Steema Tomy Sreekutty K A Seethal Sam Anju Thomas
  • 3. Law of Demand Law of demand there is an inverse relationship between price and quantity demanded. -Quantity demanded rises as price falls, other things constant. -Quantity demanded falls as prices rise, other things constant. What accounts for the law of demand? People tend to substitute for goods whose price has gone up.
  • 4. Assumptions of Law of Demand No change in price of related commodities. No change in income of the consumer. No change in taste and preferences, customs, habit and fashion of the consumers. No change in size of population. No expectation regarding future change in price.
  • 5. Individual Demand The individual demand is the demand of one individual or firm. It represents the quantity of a good that a single consumer would buy at a specific price point at a specific point in time.
  • 6. Individual Demand Schedule & Curve Price per Apple Adams Demand 30 3 25 6 20 9 15 12 10 15
  • 7. MARKET DEMAND Market demand is the aggregate of individual demands of a homogeneous commodity A market demand curve is the horizontal sum of all individual demand curves. This is determined by adding the individual demand curves of all the demanders. Sellers estimate total market demand for their product which becomes smooth and downward sloping curve.
  • 8. MARKET DEMAND FUNCTION The market demand function is the horizontal summation of the individuals' demand functions.
  • 9. From Individual Demands to a Market Demand Curve (1) Price per X Rs.0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 (2) As demand (3) Bs demand (2) Cs demand (3) Market demand 9 8 7 6 5 4 3 2 6 5 4 3 2 1 0 0 1 1 0 0 0 0 0 0 16 14 11 9 7 5 3 2 A B C D E F G H C B A D A C E F G Quantity of X demanded per week 2 Rs4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0 PriceperX(inRs 4 6 8 10 12 14 16 B Market demand