【題目】 When demand increases and supply decreases, the
equilibrium price falls, and the equilibrium quantity might increase, decrease, or remain constant.
equilibrium quantity decreases, and the equilibrium price might rise, fall, or remain constant.
equilibrium quantity increases, and the equilibrium price might rise, fall, or remain constant.
equilibrium price rises, and the equilibrium quantity might increase, decrease, or remain constant. <-----答案