Gini is a metric of wealth inequality. Wikipedia has a description though the curves it shows are more symetric than the real world distribution. Gini is a percentage. In a nation with perfectly equitable distribution of income it is zero and in a nation where one household controls all the wealth it is 100. It is the percentage of the income dollars (or what ever) shifted from lower to higher incomes.
I can't believe that it's good news for Americans that the countries that are similar to the US are Venezuela and Sri Lanka. Wealth disparity means power disparity.
