Figure3-24Producer Surplus in the Used-Textbook Market At a price of $30, Andrew, Bahira, and Carlos each sell a used book but Donna and Etienne do not. Andrew, Bahira, and Carlos get individual producer surpluses equal to the difference between the price and their cost, illustrated here by the shaded rectangles. Donna and Etienne each have a cost that is greater than the price of $30, so they are unwilling to sell a used book and so receive zero producer surplus. The total producer surplus is given by the entire shaded area—the sum of the individual producer surpluses of Andrew, Bahira, and Carlos—equal to $25 + $15 + $5 = $45.