Public Economics & Political Economy

Externalities

A side effect or consequence of an activity that is not reflected in the cost of that activity, and not primarily borne by those directly involved in said activity.

Public Goods

A commodity or service provided without profit to all members of a society, either by the government or by a private individual or organization.

Market Failures

Situations where free markets do not allocate resources efficiently, necessitating government intervention.

Positive Analysis

Analysis that focuses on factual descriptions and 'what is', often involving empirical studies without judgment.

Normative Analysis

Analysis that centers on values, ethics, and 'what ought to be', often involving discussions of fairness or moral implications.

Pareto Efficiency

A state where resources cannot be reallocated without making someone worse off.

Welfare Economics

The branch of economic theory concerned with the social desirability of alternative economic states.

Asymmetric Information

A situation where one party in a transaction has more information than the other, potentially leading to market inefficiencies.

Coase Theorem

If property rights are well-defined and bargaining is costless, parties can negotiate to resolve externalities efficiently.

Free-Rider Problem

The difficulty in charging users who benefit from non-excludable public goods, which can lead to under-provision.

Tragedy of the Commons

The overuse of common resources because individuals act in self-interest, leading to depletion.

Pigouvian Taxes

Taxes equal to the marginal external cost (MEC) at the socially optimal output level to internalize negative externalities.

Cap-and-Trade

A market-based approach to controlling pollution by providing economic incentives for achieving reductions in the emissions of pollutants.

Regression Discontinuity

A method in observational studies that analyzes outcomes around a cutoff point (e.g., GPA requirement for scholarships) to identify causal effects.

Difference-in-Differences (DiD)

A statistical technique used to compare the effect of a treatment on a treatment group before and after the treatment with a control group's outcomes.

Market Power

The ability of a firm or group to influence the price of a good or service, often seen in monopolies and oligopolies.

Instrumental Variables

A third variable used to help identify causal relationships in the presence of an endogenous treatment variable.

Production Possibility Frontier (PPF)

A curve depicting all maximum output possibilities for two goods given a set of inputs and resources.

Diminishing Returns

The principle that, as investment in a particular input increases, the incremental gains in output from that input will decrease.

Social vs. Private Costs

Social cost includes the total cost to society, whereas private cost is the cost borne directly by the individual

Market Equilibrium

The state where supply equals demand for a product, and prices stabilize.

Elasticity

A measure of how much the demand or supply of a good responds to changes in price.

Substitute Goods

Goods that can replace each other in consumption, affecting their demand.

Complementary Goods

Goods that are typically consumed together, where demand for one affects the demand for the other.

Opportunity Cost

The loss of potential gain from other alternatives when one alternative is chosen.

Consumer Surplus

The difference between what consumers are willing to pay for a good versus what they actually pay.

Producer Surplus

The difference between what producers are willing to sell a good for versus the market price.

Market Structure

The organization and characteristics of a market, determined by the number of firms, product differentiation, and ease of entry.

Monopoly

A market structure where a single seller dominates the market.

Oligopoly

A market structure characterized by a small number of firms that have significant market power.

Price Discrimination

The practice of charging different prices to different consumers for the same good or service.

Marginal Cost

The cost of producing one additional unit of a good.

External Cost

The negative impact of a transaction on third parties that is not reflected in the cost of the product.

Behavioral Economics

A field of economics that examines how psychological factors can impact economic decision-making.

Nudge Theory

An approach that proposes positive reinforcement and indirect suggestions to influence behavior and decision-making.

Types of Market Failures

Market failures can include externalities, public goods, asymmetrical information, monopolies, and incomplete markets.

Government Intervention

Actions taken by the government to correct market failures and improve market outcomes, which may include regulation, taxation, or provision of public goods.

Regulatory Intervention

Government actions that impose rules and guidelines to restrict or promote specific economic behaviors to correct market failures.

Subsidies

Financial assistance provided by the government to encourage the production or consumption of a good, counteracting market failure.

Public Provision

When the government provides goods or services directly to overcome market failure, such as public education and healthcare.

Price Controls

Government laws that set maximum or minimum prices to curb market outcomes, often to combat shortages or surpluses.

Antitrust Laws

Legislation enacted to prevent monopolistic practices and promote competition in the market.

Social Welfare Programs

Government initiatives aimed at improving the well-being of individuals, addressing market failures in areas like poverty and unemployment.

Negative Externality

A cost incurred by a third party due to an economic transaction, not reflected in market prices, leading to market failure.

Social Benefit

The total benefit to society, including both private benefit and any external benefits from a transaction.

Corrective Taxes

Taxes designed to encourage firms to reduce negative externalities, aligning private costs with social costs.

Pigovian Subsidy

A payment to encourage activities that have positive external effects, effectively increasing production of socially beneficial goods.

Environmental Regulation

Policies implemented by the government to regulate activities that negatively impact the environment, often incorporating taxes and permits.

Public Spending on Infrastructure

Government investment aimed at improving public goods that foster economic activity and address market failures.

Social Insurance Programs

Government programs designed to provide financial support in situations of economic hardship, often mitigating issues arising from market failures.

Environmental Cap-and-Trade System

A market-based approach to reducing pollution that allows companies to buy and sell permits to emit pollutants up to a designated limit.