According to CIA Gini calculations, the red and darker red countries are the most inequitable for income distribution.

We hear a lot about the "one percenters" in this country, but there is a statistical comparative tool called the Gini index, aka the Gini coefficient or Gini ratio, which measures inequality in frequency distributions. One use of Gini is to measure the inequality in income for a country.

Italian statistician Corrado Gini first published the Gini coefficient in a 1912 paper. Gini is based on a 0-1 scale. Imagine a fantasy country in which wealth was equally distributed, i.e., every household had the same income. In this idealistic country, the Gini index would be 0. So, the closer to 1 on the scale means a country with greater discrepancy in wealth distribution.