Welfare Economics
Welfare economics is the branch of economics that evaluates the well-being of society as a whole and assesses the desirability of alternative economic arrangements. It provides a framework for judging whether a particular allocation of resources is efficient and how it affects social welfare.[1]
Core concepts
Welfare economics is built around several central ideas:
- Social welfare — a measure of the overall well-being of a society.
- Efficiency — the allocation of resources such that no one can be made better off without making someone else worse off (Pareto efficiency).
- Equity — the fairness of the distribution of resources and income.
- Social welfare functions — mathematical representations of how individual utilities combine into social welfare.
Fundamental theorems
Welfare economics rests on two fundamental theorems:
| Theorem | Statement |
|---|---|
| First theorem | Under certain conditions, a competitive equilibrium is Pareto efficient. |
| Second theorem | Under certain conditions, any Pareto-efficient allocation can be achieved by a competitive equilibrium with appropriate transfers. |
These theorems establish a link between competitive markets and efficiency but say nothing directly about equity, which must be addressed through redistribution.[1]
Applications
Welfare economics provides the theoretical foundation for cost–benefit analysis, the evaluation of policy interventions, and the analysis of market failure. It is closely related to Public Economics and underpins much of the analysis of taxation and regulation.[1]