Some Important Properties of the Social Marginal Utility of Income
分析了不同人的收入社会边际效用如何随价格、公共品供给等参数变化，指出即使效用水平不变，社会边际效用也仅在特殊条件下保持不变，对应用福利经济学有用。
This paper contains an analysis of how the social marginal utilities of income assigned to different persons change in response to changes in prices, the provision of public goods and other parameters faced by the individual. The effect of a parameter change is interpreted as composed of a change in the real value of marginal income and a change in total real income (or utility level). It is implied that even if utility levels are kept constant, social marginal utilities of income remain unaltered only under special conditions, which are exposed and interpreted. The results are useful in applied welfare economics.