(rises, falls, may either rise or fall) and equilibrium quantity (rises, falls, may either rise or fall). 2-13F If demand decreases while supply simultaneously decreases, equilibrium price (rises, falls, may either rise or fall) and equilibrium quantity (rises, falls, may either rise or fall). 2-14F When government imposes a ceiling price below the equilibrium price, a results. When government sets a floor price above the equilibrium price, a results