In-Depth Notes on Social Welfare Tools: Taxes, Subsidies, Price Floors, and Price Ceilings

Introduction to Tools for Social Welfare Improvement

  • Discussed measurement of social welfare and production levels.
  • Introduction to tools: taxes, subsidies, price floors, and price ceilings.

Excise Taxes

  • Definition: A per unit tax on specific goods/services.
  • Measured in dollars/cents per unit, not as a percentage.
  • Shift marginal private cost curve upward by the amount of the excise tax.
Elasticity of Demand and Revenue
  • More Elastic Demand:
    • Greater behavior change
    • Less revenue collected.
    • Consumers shift to substitutes (e.g., tax on products with many alternatives).
  • Inelastic Demand:
    • Less behavior change
    • More revenue collected.
    • Example: Cigarette tax (addictive behavior).
Goals of Excise Taxes
  • Behavior Change:
    • Example: Taxes on smoking or pollution aimed to reduce behaviors.
  • Revenue Generation:
    • Inelastic demand products to gather funds for damage remediation.
  • Excise taxes can efficiently respond to negative externalities.

Subsidies

  • Definition: A negative excise tax; government pays part of the cost for a good/service.
Purpose of Subsidies
  • Encourage positive behaviors (e.g., buying fire extinguishers due to positive externalities).
  • Effect: Lowers consumer cost, increases production to achieve social welfare goals.
Effectiveness of Subsidies
  • Most effective with elastic demand; costly and less effective with inelastic demand.
  • Allows internalization of positive externalities to raise consumption levels.

Price Floors and Price Ceilings

Price Ceilings
  • Definition: An upper limit on prices producers can charge and consumers can pay.
  • Binding vs. Non-Binding:
    • Non-binding when set above market equilibrium (no effect).
    • Binding when set below equilibrium (affects market).
Implications of Binding Price Ceilings
  • Can lead to shortages in competitive markets (demand exceeds supply).
  • Effects on surpluses and consumer/producer welfare vary:
    • Potential loss of social welfare due to deadweight loss.
Visual Representation of Price Ceilings
  • Intersection of marginal cost and price ceiling indicates supply effects.
  • Deadweight loss arises due to unproduced welfare in the shortage range.
Price Ceilings in Monopolies
  • Price ceilings can improve efficiency within monopolistic markets by lowering prices and increasing output.
  • Opposite effects if poorly set (too low can cause shortages).
Price Floors
  • Definition: A lower limit imposed on prices producers can charge.
  • Can also be binding or non-binding.
  • Binding price floors cause surpluses (more supplied than demanded).
Market Effects of Price Floors
  • Creates inefficiencies by producing surplus goods that are not purchased.
  • Monopsony dynamics discussed but not covered in detail.

Conclusion

  • Price mechanisms can improve inefficiencies in monopolistic or non-competitive environments.
  • Effective public policy intervention can mitigate market failures and enhance social welfare.