Question

Distinguish between a change in quantity supplied and a change in supply.

Distinguish between movement along a supply curve and shifts of a supply curve.

Using graph distinguish between change in supply and change in quantity supplied.

Answer 1

	Basis	A change in quantity supplied	A change in supply
1.	Meaning	Other things remaining the same, when supply of a commodity changes due to change in the price of the commodity, it is called change in quantity supplied.	When supply of a commodity changes due to factors other than the commodity's own price, it is called change in supply.
2.	Types	There are two types of change in quantity supplied: Expansion of supply Contraction of supply	Change in supply is also of two types: Increase in supply Decrease in supply
3.	Effect on Supply Curve	It results in movements along the same supply curve.	It results in a shift of supply curve.
4.	Diagram	Upward movement from A to B shows expansion of supply. Downward movement from A to C indicates contraction of supply.	Rightward shift of supply curve from SS to S1 S1 indicates increase in supply. Leftward shift of supply curve from SS to S2S2 indicates decrease in supply.