Chapter 9 Study Guide: Externalities and Public Goods

Introduction

The chapter focuses on Externalities and Public Goods, highlighting situations where markets fail to maximize societal value.
Reference to previous chapters (Chapters 7 and 8):
- These chapters demonstrate the value of markets operating at their optimal efficiency.
Key concept introduced: Relation between supply and demand curves, including additional curves representing societal costs and benefits.

Key Ideas

Market Failure: Free markets do not always maximize social surplus due to several critical factors.
Three Cases of Market Failure:
- Externalities: Unaccounted costs or benefits incurred by third parties not directly involved in the economic transaction.
- Public Goods: Goods that are non-excludable and non-rivalrous, leading to challenges in funding and provision.
- Common Pool Resources: Resources that are inaccessible due to overconsumption and depletion.
Differential Impact on Social and Private Costs/Benefits:
- Each case emphasizes the divergence between private gains/losses versus societal impacts.
Role of Government: Government intervention is crucial for enhancing market outcomes when these failures occur.

Main Terms and Concepts

Negative Externality: An economic activity that results in adverse side effects for others not involved in the transaction. Examples include pollution from a factory affecting nearby residents.
Positive Externality: An economic activity that results in beneficial side effects for others. An example could be an individual getting vaccinated, which contributes to herd immunity.
Coase Theorem: The principle asserting that private negotiations can lead to efficient resource allocation, provided property rights are well defined, and transaction costs are negligible.
Pigouvian Tax: A tax imposed on activities that create negative externalities, intended to incentivize firms to reduce output to the socially optimal level. For example, taxing carbon emissions to reflect their societal costs.
Pigouvian Subsidy: Financial support provided to encourage activities that generate positive externalities, thereby enhancing overall output towards a socially optimal level.
Rival Good: Goods that can only be consumed by one person at a time. Examples include a slice of pizza or a parking space.
Non-Rival Goods: Goods that can be consumed by multiple individuals simultaneously, such as a public park or digital media.
Excludable Goods: Goods that require payment to access. Examples include subscription services or private clubs.
Non-Excludable Goods: Goods that can be accessed without payment; this includes public resources like air quality or national defense.
Free Rider Problem: A challenge occurring when individuals benefit from a good without contributing to its cost, particularly in the context of non-excludable goods.
Tragedy of the Commons: A scenario depicting the overuse of common-pool resources, leading to depletion and adverse social outcomes. An example includes overfishing in a shared ocean.