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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.
The main difference is quantity is something like length, while unit is a particular measure like meter. Fundamental quantities are a set of orthogonal units which all other quantities(derived) can be based on. For instance speed can be derived from length divided by time. However, time can't be derived from any other.