012. Market equilibrium may not be achieved if there is A) only price ceiling. B) only price floor. C) both price floor and price ceiling. C) neither price ceiling nor price floor. 013. The price floor is set the equilibrium price. A) none of the above. B) higher than. C) lower than. D) equal to. 014. An increase in population tends to A) increase both equilibrium price and quantity. B) decrease both equilibrium price and quantity. C) increase equilibrium quantity and decrease equilibrium price. D) increase equilibrium price and decrease equilibrium quantity