In the figure above, if the government sets the legal price of gasoline at $1 a gallon and it constrains the market then the $1 acts as O a price ceiling. an equilibrium price. O a just price. O a price floor. Price per Gallon 2005 1.50 1.00 50 20 40 Market for Gasoline 60 80 100 Gallons of Gas per week in thousands 120 140 S Ceteris Parabis D d' 160