Demand In economics, we need to use terms a little more carefully than they are sometimes used in ordinary discussions. In general use, "Demand" is a word that can have more than one meaning, but in microeconomics we define it more carefully so that it has only one meaning. Here is the definition: Demand is the relationship between price and quantity demanded for a particular good and service in particular circumstances. For each price the demand relationship tells the quantity the buyers want to buy at that corresponding price. The quantity the buyers want to buy at a particular price is called the Quantity Demanded. The key point is to distinguish between demand (