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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.
An increase in quantity demanded is caused by: â¢ a decrease in the price of the product. A demand curve illustrates how much the quantity demanded changes when the price changes. A change in quantity demanded is represented as a movement along a demand curve. In the diagram below, there is an increase in the quantity demanded from two to four when the price of a hamburger falls from $4 to $2. This is illustrated by the movement along the demand curve from point B to point D. Figure 4.