1. Price Ceiling A price set below equilibrium price, which is enforced by 2. Tax government as the highest price that can be charged for a good or 3. Market Failure service. A situation where when a good or 4. Public Goods service is made available to one person, it is made available to others and where consumption by 5. Non-rival one will not diminish consumption by others. 6. Negative Externality When a person or firm is required to make a payment to the 7. Non-Excludable government. One reason may be to try and correct for a negative 8. Price floor externality. 9. Shortage A price set above equilibrium O hp