Movement along with supply curve


Extension and contraction of supply are the changes in supply due to change in price.    The extension of supply takes places when price rises, and contraction of supply takes places when price falls.

When all other things remain unchanged, a price change normally cause a change in supply, either extension or contraction of supply. 


The changes in price would cause a movement along with the supply curve. 
As price increases from 10 to 15 the quantity supplied also increases from 12 to 18 and supply move along with the curve from point A to point B as shown in the diagram as extension of supply.  The contraction of supply is also shown below as the price falls from 25 to 20 the quantity supplied will decrease from 30 to 24 along with the supply curve from the point D to C.  

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