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a change in demand is a movement along the demand curve, and a change in quantity demanded is a shift in the demand curve. 3 people found this useful. Edit. Share to: 1  The Job Outlook and Salary Trends for a Cosmetologist Cosmetology is a field with many different opportunities for its professionals.
Demand and supply are two vital concepts that decide the market price of a commodity. If demand is expressed in quantity that is desired by people, and who are willing to buy a product at a certain price, supply refers to the quantity that the market is willing to offer in lieu of the price manufacturers are getting.