Without price controls,the market clears at the equilibrium price and quantity Po and Qo. If price is regulated to be no higher than Px,the quantity supplied falls to Q,the quantity demanded increases to Q2, and a shortage develops(逐步显示出来，.Without price controls, the market clears at the equilibrium price and quantity P0 and Q0 . If price is regulated to be no higher than Pmax , the quantity supplied falls to Q1 , the quantity demanded increases to Q2 , and a shortage develops(逐步显示出来)