To affect the market outcome, a price ceiling
Amust be set below the black market price.
Bmust be set below the legal price.
Cmust be set below the price floor.
Dmust be set below the equilibrium price.
Amust be set below the black market price.
Bmust be set below the legal price.
Cmust be set below the price floor.
Dmust be set below the equilibrium price.