Discuss the two basic ways in which price-levels are affected by Market Surpluses.

Price ceilings prevent a price from rising above a certain level.
When a price ceiling is set below the equilibrium price, quantity demanded will exceed quantity supplied, and excess demand or shortages will result.
Price floors prevent a price from falling below a certain level.
When a price floor is set above the equilibrium price, quantity supplied will exceed quantity demanded, and excess supply or surpluses will result.
When government laws regulate prices instead of letting market forces determine prices, it is known as price control.