Change in supply refers to a shift in the entire supply curve for a good or service, while quantity supplied refers to the amount of a good or service that is being offered for sale at a particular price. These two concepts are closely related, but they are not the same thing.
Change in supply occurs when there is a change in the factors that affect the production of a good or service. This could be due to changes in the cost of production, changes in technology, or changes in the availability of resources. When the supply of a good or service increases, the supply curve shifts to the right, while a decrease in supply shifts the curve to the left.
Quantity supplied, on the other hand, refers to the amount of a good or service that a producer is willing and able to sell at a particular price. This is represented by a point on the supply curve. If the price of a good or service increases, the quantity supplied will also increase, as producers are willing to produce and sell more at a higher price. Conversely, if the price decreases, the quantity supplied will also decrease, as producers are less willing to produce and sell at a lower price.
It is important to note that change in supply and quantity supplied are not the same thing, and they can have different effects on the market. For example, if there is a change in the cost of production that leads to an increase in the supply of a good or service, the entire supply curve will shift to the right, and the quantity supplied at each price will increase. However, if the price of the good or service increases, the quantity supplied will also increase, but the supply curve will not shift.
In summary, change in supply refers to a shift in the entire supply curve for a good or service, while quantity supplied refers to the amount of a good or service that is being offered for sale at a particular price. These two concepts are closely related, but they are not the same thing, and understanding the difference between them is important for analyzing market conditions and making informed decisions.