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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 is the entire downward sloping line on a Price vs. Quantity graph. Supply is the entire upward graph line on a P vs. Q graph. QD and QS are just single points on the their respective graphs. Let's say I own a candy shop, and I get 20 customers a day. Then the next day I bump up my price out of the blue.