than $g$ where $f,g:[0,1]\rightarrow \mathbb{R}$ are both increasing. The only index which I am aware of and could be used for this purpose is the Gini coefficient. Thanks. convexity fa.functional-analysis flag edited Aug 4 2011 at 9:03 asked Aug 3 2011 at 18:27 VitoshKa 11 ● 1 Could you explain what