Change in Quantity Supplied and Change in Supply

Change in Quantity Supplied

This is a situation which is due to a rise or fall in the price of a commodity/service and it is described by a movement along the supply curve for the commodity/service.

Figure: Movement induced by an increase in commodity’s own price

Figure: Movement due to a decrease in commodity’s own price

Change in Supply

This is a situation which is due to a variation in any determinant of supply other than commodity/service own price and it is described by a shift in the supply curve for the commodity or service.

Figure: An increase in supply

Figure: A decrease in supply