when the data in the demand schedule is graphed to create the demand curve it supplies a visual demonstration of the relationship between price and demand allowing easy estimation of the demand for a product or service at any point along the curve 
a demand schedule tabulates the quantity of goods that consumers will purchase at given prices demand schedules vs supply schedulesa demand schedule is typically used in conjunction with a supply schedule which shows the quantity of a good that would be supplied to the market by producers at given price levels by graphing both schedules on a chart with the axes described above it is possible to obtain a graphical representation of the supply and demand dynamics of a particular market in a typical supply and demand relationship as the price of a good or service rises the quantity demanded tends to fall if all other factors are equal the market reaches an equilibrium where the supply and demand schedules intersect at this point the corresponding price is the equilibrium market price and the corresponding quantity is the equilibrium quantity exchanged in the market 