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Differentiate between change in demand and change in quantity demanded.

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Change in demand or Shift of the demand curve: 

(i) This happens when at the same price more or less is demanded. 

(ii) Other factors affecting demand change causing a right or leftward shift of the demand curve.

(iii) It is of two types - increase in demand (rightward shift) and decrease in demand (leftward shift). 

Change in Quantity demanded

Change in quantity demanded or movement along the demand curve: 

(i) This happens, when at a lower(higher) price, more(less) is demanded. 

(ii) Other factors affecting demand remain constant. 

(iii) It is of two types – expansion(downward movement along a demand curve and contraction of demand (upward movement along a demand curve).

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