Unit 5: Basics of Welfare Economics

1. Welfare Economics: Concepts & Individual vs Social Welfare

Welfare economics is a branch of economics that uses microeconomic techniques to evaluate well-being (welfare) at the aggregate (economy-wide) level.

• Individual Welfare: Refers to the satisfaction or utility that a single person derives from their consumption of goods and services.
• Social Welfare: Refers to the total well-being of the entire community or society. Determining social welfare often involves aggregating individual utilities, which leads to complex ethical questions.

2. Value Judgements & Pigovian Welfare Economics

Value Judgements

Unlike positive economics, which describes "what is," welfare economics involves Value Judgements—normative statements about what "ought to be" regarding economic fairness and distribution.

Pigovian Welfare Economics

Developed by A.C. Pigou, this approach focuses on maximizing economic welfare through national income.

• Pigou argued that social welfare is maximized when national income is maximized, provided it does not lead to a more unequal distribution.
• He introduced the concept of the difference between private marginal product and social marginal product, suggesting government intervention to correct these gaps.

3. Pareto Optimality: Concept and Conditions

Pareto Optimality is the standard benchmark for economic efficiency.

Definition: An economic state is Pareto Optimal if it is impossible to make any one individual better off without making at least one other individual worse off.

Conditions for Pareto Optimality:

• Efficiency in Exchange: Resources are allocated such that the Marginal Rate of Substitution (MRS) is equal for all consumers.
• Efficiency in Production: Resources are used such that the Marginal Rate of Technical Substitution (MRTS) is equal for all producers.
• Product-Mix Efficiency: The combination of goods produced matches consumer preferences (MRS = MRT).

4. Social Welfare Function

A Social Welfare Function (SWF) is a mathematical tool used to rank different social states based on the utility levels of individuals within that society.

• It helps in making social choices when a policy makes some people better off but others worse off.
• The "Grand Optimum" or "Bliss Point" is reached where the highest possible social indifference curve is tangent to the utility possibility frontier.

5. Externalities and Public Goods

Welfare economics explains why markets might fail to reach a Pareto Optimal state, necessitating government intervention.

Externalities

Externalities occur when the production or consumption of a good affects third parties who are not involved in the transaction.

• Negative Externality: Pollution from a factory (Social Cost > Private Cost).
• Positive Externality: Vaccinations or education (Social Benefit > Private Benefit).

Public Goods

Public goods are goods that are non-excludable and non-rivalrous (e.g., national defense or clean air). Because private firms cannot easily charge for these, they are typically under-provided by the market, requiring the state to provide them.