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The difference between demand and quantity demanded is in the definition of them. Demand is the amount of demand at all possible prices; while quantity demanded is the amount â¦ of demand at a particular price. 21 people found this useful. Answered.
On the other hand, change in demand refers to increase or decrease in demand of a product due to various determinants of demand, while keeping price at constant. Changes in quantity demanded can be measured by the movement of demand curve, while changes in demand are measured by shifts in demand curve. The terms, change in quantity demanded refers to expansion or contraction of demand, while change in demand means increase or decrease in demand. 1. Expansion and Contraction of Demand: The variations in the quantities demanded of a product with change in its price, while other factors are at constant, are termed as expansion or contraction of demand. Expansion of demand refers to the period when quantity demanded is more because of the fall in prices of a product.