The Rawlsian welfare function measures the social welfare of society on the basis of the welfare of the least well-off individual member of society:
The opposite of the Rawlsian welfare function can measure welfare of the society based on the welfare of the best well-off individual member of society.
An allocation that maximizes the welfare of a society must be Pareto efficient. Pareto efficient is is a constructive model in economics for determining whether a system or market is at an efficient state.
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