A) An ineffective price floor set above equilibrium
B) An effective price floor set below equilibrium
C) An ineffective price ceiling set above equilibrium
D) An effective price ceiling set below equilibrium
A price floor is the lowest possible price at which a certain type of good is sold at. This is usually set by the government so as to keep the rate of goods from decreasing below a certain point. This price floor is indicated by a horizontal line on the graph above the intersection of the supply and demand curves.