Social welfare, policy evaluation, distribution, and measurement.
Welfare economics takes the philosophical question of what counts as welfare and asks how it can be measured, aggregated across a population, and used to evaluate policy. The field's central difficulty is aggregation itself: turning many individuals' welfare into one social ranking runs into deep formal obstacles that shape everything from cost-benefit analysis to tax policy.
Why turning individual welfare into a single social ranking runs into deep formal obstacles, from interpersonal comparability to Arrow's impossibility theorem.
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