Market Failures - Externalities

Market Failures

• Market failures occur when the allocation of goods and services by a free market is not efficient.

• Common causes of market failures include externalities, public goods, and asymmetric information.

Externalities, Public Goods, Asymmetric Information

Externalities

• An externality is a cost or benefit incurred by a third party who did not choose to incur that cost or benefit.

• Types of externalities:

  • Negative Externalities: E.g., pollution from a factory affecting local residents.

  • Positive Externalities: E.g., a bee-keeper benefiting from pollination by nearby apple orchards.

Public Goods

• Public goods are not excludable and not rival in consumption. E.g., street lighting.

• Markets may underprovide public goods due to the free-rider problem.

Asymmetric Information

• Asymmetric information occurs when one party in a transaction has more or better information than the other. This can lead to adverse selection or moral hazard.

Perfectly Competitive Markets

• In a perfectly competitive market, efficiency is achieved when:

  • Marginal Cost (MC) = Marginal Benefit (MB)

• However, real markets often deviate from this ideal:

  1. Presence of a limited number of firms (monopoly, oligopoly, monopolistic competition).

  2. Imperfect information exists about product quality.

  3. Not all goods are for private consumption (consideration of public goods).

  4. External costs or benefits are not fully considered, leading to externalities.

Externalities in Production

Negative Externalities

• Occurs when production imposes costs on external parties. Examples include:

  • Pollution from factories diminishing air quality.

  • Oil spills harming local fisheries.

• Implication: Marginal Social Cost (MSC) > Marginal Private Cost (MPC)

• Value of negative externality: MSC - MPC

Positive Externalities

• Occurs when production generates benefits for external parties. Example:

  • Bees pollinating crops next to orchards.

• Implication: MSC < MPC

• Value of positive externality: MPC - MSC

Externalities in Consumption

Negative Externalities

• Arises when consumption imposes costs on others. Examples include:

  • Secondhand smoke affecting non-smokers.

  • Noise pollution from loud music late at night.

• Implication: Marginal Social Benefit (MSB) < Marginal Private Benefit (MPB)

• Value of negative externality: MPB - MSB

Positive Externalities

• Occurs when consumption benefits others. Examples:

  • Education leading to a more informed population.

  • Vaccination benefiting public health.

• Implication: MSB > MPB

• Value of positive externality: MSB - MPB

Addressing Externalities

• When MB ≠ PMB or MC ≠ PMC, an externality exists, indicating market failure.

• Corrections for externalities:

  1. Tax Production: Implement a Pigovian tax to align PMC with SMC.

  2. Government Regulation: Set production standards to minimize pollution.

  3. Coase Theorem: Allow bargaining between affected parties to arrive at an efficient outcome.

Case Study: Pollution

• Negative externality from production leads to:

  • Market output at an inefficient level due to PMC < SMC.

  • Social optimum occurs where SMB = SMC, not achieved without intervention.

Correcting Negative Production Externalities

1. Pigovian Tax: Raises PMC to match SMC at efficient production level.

2. Government Regulation: Mandate cleaner production methods.

3. Negotiation: Facilitate bargaining between firms and affected parties.

Positive Consumption Externality: Education

• Education provides private and social benefits.

• If a student chooses Y1 years of education:

  • Private Marginal Benefit (PMB) is the benefit to the individual.

  • Social Marginal Benefit (SMB) includes external benefits.

• Optimal education level is where SMB = SMC (YE years).

Incentivizing Education

1. Subsidies: Reduce costs to encourage enrollment in education.

2. Payments: Compensate students to align private benefit with social benefit.