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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.
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.