Respuesta :
A change in demand is represented by a shift in the demand curve while a change in quantity demanded is represented by movement.
Change in demand is represented by the shift in demand curve which is occurred due to change in other factors such as tastes and preference, real income, related goods. Increase in demand will shifts the curve forward and decrease in demand will shifts the curve backward.
Change in quantity demanded is represented by the movement of the demand curve which is occurred due to change in price only , other factors remain constant. It moves upward and downward.
When the price of the commodity decreases and quantity demanded increases results in downward movement of demand curve which is also known in extension.
When the price of the commodity rises, the quantity demanded falls, results in upward movement of demand curve and also known as contraction of demand.
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