Individual Supply Curves and the Market Supply CurvePanel (a) shows the individual supply curve for Mr. Silva, SSilva, the quantity of cotton he will sell at any given price. Panel (b) shows the individual supply curve for Mr. Liu, SLiu. The market supply curve, which shows the quantity of cotton supplied by all producers at any given price, is shown in panel (c). The market supply curve is the horizontal sum of the individual supply curves of all producers.