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Welfare Economics

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Welfare Economics
Economists can give very useful guidance to society on matters of efficiency, but their value judgements on matters of distribution are no better than anyone else's. When economists say that a particular government policy or an institutional change (that is, change in the rules according to which people do business with each other) leads to a gain in efficiency they mean something very specific. They mean that under the new arrangement it would be possible to make everyone better off. That is, the gainers could compensate the losers and still have something left over. Once such efficiency gains have been fully exploited and a situation has been reached where no further efficiency gains are possible, where one person's situation can only be improved by making someone else worse off; we say that the allocation of resources in the economy is Pareto Optimal or Pareto Efficient. The concept is named after Vilfredo Pareto (1848-1923).
The production and consumption of the various goods in the economy is Pareto Optimal when the combined rents to producers and consumers are the largest that can be obtained. Since these optimal quantities produced and consumed depend on the positions of the demand curves for the various goods, and since the demand curve for any good depends on the distribution of income between those who like the good a lot and those who do not, changes in the distribution of income will affect the demand curves for the various commodities and the maximum consumer and producer rents that can be obtained by producing and consuming them. The Pareto-Efficient production and consumption levels for the commodities produced and consumed in the economy will thus depend on the distribution of income---the fact that a situation is Pareto Optimal therefore does not imply that the distribution of income at which it arises is a socially desirable

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