In this paper, Gini Regression Analysis (Olkin and Yitzhaki 1992) is applied to check the robustness of the positive correlation of the number of billionaires, billionaires' wealth, and the GDP per-capita, as reported in Prinz (2016). Although Gini Regression Analysis (GRA) as a method exists...

As embodied in the concept of "inequality extraction" (Branko Milanovic), it is not possible to increase inequality (especially income inequality) in a society sustainably to levels beyond what is actually socially acceptable (and even less to levels endangering physical subsistence of parts of...