http://mapscroll.blogspot.de/2009/04/income-inequality-in-europe.html

The Gini Coefficient is a number from 0 to 100  (or 0 to 1) that represents the equality or inequality of income distribution. 0 is absolute equality, and 100 is one person having everything and everyone else going without.
There are many differences within Europe, is there an ideal Gini-Coefficient for a society?