A change in quantity demanded refers to movement along an existing demand curve caused by a change in price, while keeping other factors constant. A change in demand causes a shift in the demand curve itself, due to changes in non-price factors that influence demand like income, tastes, prices of related goods, and expectations. Specifically, a change in demand results from changes to the underlying determinants of demand other than price, shifting the curve either left or right, while a change in quantity demanded occurs along the original demand curve from a change in price alone.

1. Change in Quantity Demand
vs
Change in Demand
Name: Siddhant Bhandari
Section: PGDM 4
PRN NO: DM17D49

2. What is Demand?
• Demand in economics is how many goods and services are
bought at various prices during a certain period of time.
• Demand is the consumer's need or desire to own the
product or experience the service.
Determinants of Demand
Pricing factor
Non Pricing
factors

3. Change in Quantity Demand
• A change in quantity demanded is a change in the
specific quantity of a good that buyers are willing
and able to buy.
• This change in quantity demanded is caused by a
change in the demand price.
• The demand price induces a change in the quantity
demanded and a movement along the demand
curve, the non-pricing determinant remains
unchanged.

4. Change in Demand
• A change in demand is the result of a change in any
of the non-pricing determinant of a demand.
• The demand curve move either to left or right side.
• A negative change in demand shifts the curve left,
and price and quantity both fall.
• A positive change in demand shifts the curve right,
and price and quantity both rise.

5. Difference between change in quantity demand &
change in demand
Change in quantity demand Change in demand
1. Expansion & Contraction:
• Ceteris paribus ,there is an
upward or downward
movement in a demand
curve due to change in
price.
Upward movement=Contraction
Downward movement=Expansion
1. Increase & Decrease:
• There is shift in demand
curve either to left or right
due to change in
determinants of demand
other than price .
Shift toward right: Increase
Shift toward left: Decrease