In economics, the demand and supply curve is a graphical representation of how changes in the price of a product affect its quantity demanded (demand) and its quantity supplied (supply). The demand curve shows the quantity of a good that consumers are willing to buy at each price. Similarly, the supply curve shows the quantity of a good that producers are willing and able to produce at each price. Both curves intersect at the equilibrium point, where the quantity supplied equals the quantity demanded and no further trades can occur in the market without changing the price.