An overview of the field of public economics, including the role of government in the economy, different types of government intervention, and the importance of public goods and externalities.
Introduction to Public Economics
Key concepts, objectives, and analytical tools
| Aspect | Description |
|---|---|
| Definition | Study of how government policies affect the allocation and distribution of resources in an economy. |
| Scope | • Provision of public goods • Taxation & revenue collection • Redistribution & welfare • Regulation of externalities • Fiscal federalism & inter‑governmental transfers |
| Goal | Explain why governments intervene, evaluate the efficiency and equity of those interventions, and design policies that improve social welfare. |
| Question | Economic Issue | Typical Policy Tool |
|---|---|---|
| What to provide? | Public goods, merit goods, correction of market failures | Direct provision, subsidies, regulation |
| How to provide it? | Choice of delivery mechanism (government agency, public‑private partnership, contracts) | Procurement rules, performance‑based contracts |
| Who should pay? | Tax incidence, burden sharing, equity | Income taxes, consumption taxes, user fees |
| How much? | Optimal level of provision, fiscal balance | Budget constraints, cost‑benefit analysis |
| Type of Failure | Description | Example | Policy Response |
|---|---|---|---|
| Public Goods | Non‑rival and non‑excludable → free‑rider problem | National defense, street lighting | Government provision financed by taxes |
| Externalities | One party’s actions affect others without compensation | Pollution, vaccination | Pigouvian taxes/subsidies, regulation |
| Information Asymmetry | One side has better information, leading to adverse selection or moral hazard | Health insurance, used‑car market | Mandatory disclosure, licensing, standards |
| Monopoly Power | Single seller can set price above marginal cost | Utilities, railways | Price regulation, public ownership, antitrust law |
| Merit & Demerit Goods | Society values certain goods more/less than private market reflects | Education, cigarettes | Subsidies, taxes, bans |
| Characteristic | Non‑rivalry | Non‑excludability |
|---|---|---|
| Pure public good | Yes | Yes |
| Impure (club) good | Partially | Partially (excludable through membership) |
| Common‑pool resource | Yes (non‑rival until congestion) | No (excludable) |
Optimal provision condition:
( \displaystyle \sum_{i=1}^{N} MB_i = MC )
(where (MB_i) = marginal benefit to individual i, (MC) = marginal cost of provision).
| Principle | Meaning |
|---|---|
| Equity | Horizontal equity (similar ability to pay → similar tax burden); vertical equity (higher ability → higher burden). |
| Efficiency | Minimize excess burden (deadweight loss). |
| Revenue Adequacy | Generate sufficient funds for public expenditures. |
| Simplicity & Transparency | Easy to understand, comply with, and enforce. |
| Tax Type | Base | Typical Rate Structure | Main Advantages |
|---|---|---|---|
| Income tax | Labor & capital income | Progressive brackets | Redistributive, aligns with ability to pay |