Relative income position, individual and social income satisfaction, and income inequality

Summary

The survival probability as estimated by an individual is,ceteris paribus supposed to depend on his relative income position in a set of reference incomes. The relative income position is thus defined in close connection to the preference formation theory of Kapteyn. It is shown that then this survival probability, called ‘utility,’ may be equated to the relative income position. A nice result of this approach is the possibility to formulate a utilitarian welfare function, which leads to the definition of income inequality measures. It is shown that the use of sets of reference incomes may lead to considerably smaller measured inequality.