Economics: Externalities and Market Failures Study Notes

Module Overview

  • Final module on supply and demand.

  • Focus on externalities as a major form of market failure.

  • Transition to apply graphs and tables later in the module.

  • Important for students to submit work and aim for high grades (tens).

Market Failures

  • Market failures refer to situations where the market fails to produce desired outcomes.

  • Main concepts to cover:

    • Externalities: Costs or benefits that affect third parties not involved in a transaction.

    • Public Goods and Common Resources: Topics to be examined later in the module.

Importance of Practice and Preparation

  • Encouragement to complete Quiz #7 due this Friday.

  • Module 7 practice quiz recommended for exam preparation.

Basic Concepts of Market Failures

  • Emphasizing social versus private costs.

    • Social costs incorporate the costs borne by society, while private costs are those incurred by individual producers.

  • Reference to previous modules for background on social vs. private.

  • Markets are traditionally assumed to operate under perfect competition, leading to efficient outcomes where social benefit equals social cost.

Regulatory Measures

  • Discussion on how government interventions (ceilings, floors, subsidies) play into market failures, leading to overproduction or underproduction.

  • Introduction to the concept that competitive markets may be inefficient when externalities are considered.

Types of Market Failures

  1. Positive Externalities: Benefits that positively affect third parties.

  2. Negative Externalities: Costs that negatively affect third parties.

  • Examples include:

    • Negative Externality: Secondhand smoke is a classic example, harming non-smokers in vicinity.

    • Positive Externality: Vaccines, as they protect not only the vaccinated but also others due to reduced disease transmission.

Impact on Supply and Demand Structure

  • Negative externalities shift the supply curve to the left (increasing costs) whereas positive externalities shift the demand curve to the right (increasing benefits).

  • Need to determine which equilibrium quantity (private vs. social) is being analyzed for accurate application of models and calculations.

Marginal Analysis in Externalities

  • Externality Definition: An externality is a cost or benefit incurred by a third party.

  • The goal is to assess costs (external) and benefits (marginal social benefit, MSB) against marginal private costs.

Market Equilibrium Considerations

  • Identification of equilibrium points on a graph, which highlights differences between private and social equilibriums.

  • Understanding discrepancies in cost-benefit dynamics inherent in externalities.

Government Policies and Solutions

  • Policies aim to correct market failures by addressing externalities, with key strategies including:

    • Taxation on negative externalities to reduce their occurrence or impact.

    • Cap and Trade Systems permit trading of pollution rights to manage environmental costs efficiently.

Coase Theorem

  • Coase Theorem offers a solution to externalities through property rights establishment. Key conditions include:

    • Clearly defined property rights.

    • Limited parties involved, allowing negotiation.

    • Low transaction costs for agreements to be made.

  • Real-world application: How the government assigned property rights can influence outcomes favorably or unfavorably.

Conclusion and Future Topics

  • Upcoming focus on implications of monopolies and antitrust laws regarding market power.

  • Next classes will delve into the inefficiencies created by monopolies contrasted with competitive markets.

  • Importance of frameworks and theories from economics to influence real-world policy decisions and resolve externality challenges.