Market Interventions and Taxation Revision Sheet

📌 The Essentials

• Supply and demand determine market equilibrium prices and quantities.
• Governments use price controls, taxes, and subsidies to correct market failures.
• Price ceilings below equilibrium cause shortages; price floors above cause surpluses.
• Taxation creates a wedge, impacting prices, quantities, and welfare (deadweight loss).
• The incidence of tax depends on the elasticities of supply and demand.
• Subsidies can increase production or consumption but lead to fiscal costs.
• Deadweight loss reflects inefficiency from market distortions.
• Effective tax systems balance efficiency and fairness principles.
• Elasticity measures responsiveness; critical for analyzing market impacts.
• Market regulations must consider administrative costs and equity.

📖 Key Concepts

Market equilibrium: The point where quantity supplied equals quantity demanded, setting the natural market price and quantity.

Price control: Government regulation setting legal maximum or minimum prices in a market.

Price ceiling: A maximum price set below equilibrium, often causing shortages.

Price floor: A minimum price set above equilibrium, potentially leading to surpluses.

Tax incidence: The distribution of the tax burden between buyers and sellers, influenced by elasticities.

Deadweight loss: The welfare loss due to market inefficiencies caused by interventions like taxes or price controls.