The market for paper in a particular region in the U.S. is characterized by the following demand and supply functions
4. The market for paper in a particular region in the U.S. is characterized by the following demand and supply functions: P = 80 - 0.0005 QD P = -20 + 0.0005 QS where QD is the quantity demanded of paper in 100 pound (lb.) lots, QS is the quantity supplied of paper in 100 pound (lb.) lots, and P is