Chapter 4: Concise

Market Equilibrium

  • Market demand curve = Marginal Benefit (MB)
  • Market supply curve = Marginal Cost (MC)
  • Equilibrium occurs when Qd = Qs, implying MB = MC.
  • If MB > MC, under-production; if MB < MC, over-production.
  • Market efficiency achieved at MB = MC, maximizing consumer and producer surplus.

Market Failure

  • Market failure occurs when equilibrium leads to misallocation of resources.
  • Sources: Lack of competition, externalities, public goods.

Lack of Competition

  • Monopoly leads to high prices and inefficient equilibria.
  • Justifies government intervention for efficiency.

Externalities

  • Positive Externalities: Benefits passed to non-consumers (e.g., vaccinations).
    • Government subsidies and regulation may be used.
  • Negative Externalities: Costs imposed on others (e.g., pollution).
    • Solutions: Taxes and regulations; necessary interventions to reduce negative impacts.

Taxes and Subsidies

  • Pollution tax reduces output and increases costs for firms.
  • Subsidies to increase vaccination demand, affecting prices.

Public Goods

  • Characteristics: Non-rivalry and non-excludability.
  • Examples: National defense, public parks, public broadcasting.
  • Free Rider problem complicates provision and funding.

Policies to Correct Market Failure

  • Regulation, taxes/subsidies, price controls.

Price Controls

  • Binding price ceiling: Legal maximum price, can cause shortages (e.g., rent control).
  • Non-binding price ceiling: Higher than equilibrium price, does not affect market.
  • Price floor: Legal minimum price (e.g., minimum wage) can cause surpluses/unemployment.
    • Not binding if below equilibrium price.

Conclusion

  • Government interventions are necessary to correct market inefficiencies, but can lead to their own complications like shortages and unemployment.