What is Change in Supply?

A supply curve is used to show the relationship between a commodity’s price and quantity supplied, assuming that all other factors remain constant. However, sooner or later, other factors will be bound to change. When one of the other factors changes, other than the own price of the commodity, then it is referred to as a Shift in the Supply Curve. Thus, changes in supply occur when the supply for a commodity changes as a result of a change in a factor other than the price of the commodity. There are two cases in the shift in supply curve,

1. Increase in Supply (A Rightward Shift)
2. Decrease in Supply (A Leftward Shift)

An increase in the supply of a commodity due to factors other than the own price of the commodity is known as an Increase in Supply. In simple terms, the supply for a commodity increases at the same price, because of changes in other factors, other than own price of the commodity. An increase in supply results in a rightward shift in the supply curve. A decrease in the supply of a commodity due to factors other than the own price of the commodity is known as a Decrease in Supply. In simple terms, the supply for a commodity decreases at the same price, because of changes in other factors, other than own prices of the commodity. A decrease in supply results in a leftward shift in the supply curve.

The terms Change in Quantity Supplied and Change in Supply are usually used interchangeably but are different from various prospects. Change in quantity supplied is defined as the change in the level of the quantity that the seller wishes to sell at a particular price, occurring due to a change in the price of the commodity (other factors remaining constant). Change in supply is defined as the change in the level of the quantity that the seller wishes to sell at a particular price, occurring due to changes in other factors of the supply (own price of the commodity remains the same).