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Economy > Inequality > Gini coefficient > Level: **Countries Compared**

Income inequality among individuals is measured here by five indicators. The Gini Coefficient is based on the comparison of cumulative proportions of the population against cumulative proportions of income they receive, and it ranges between 0 in the case of perfect equality and 1 in the case of perfect inequality. The mean log deviation is the average value of the logarithm of the ratio of mean income to the income of each decile. The squared coefficient of variation is the variance of average income of each decile, divided by the square of the average income of the entire population. The P90/P10 ratio is the ratio of the upper bound value of the ninth decile (i.e. the 10% of people with highest income) to that of the first. The P50/P10 ratio is the ratio of median income to the upper bound value of the first decile. The mean log deviation and inter-decile ratios have a lower value of 1 and no upper bound, while the squared coefficient of variation has a lower bound of 0 and upper bound of infinity.

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### Interesting observations about Economy > Inequality > Gini coefficient > Level

- 27 of the bottom 28 countries by inequality > gini coefficient > level are High income OECD.
- United States ranked first for inequality > gini coefficient > level amongst Group of 7 countries (G7) in 2009.
- All of the top 2 countries by inequality > gini coefficient > level are Emerging markets'.
- All of the bottom 15 countries by inequality > gini coefficient > level are European.
- Portugal ranked first for inequality > gini coefficient > level amongst European Union in 2009.
- Turkey ranked first for inequality > gini coefficient > level amongst NATO countries in 2009.
- Italy ranked second for inequality > gini coefficient > level amongst Eurozone in 2009.
- 11 of the bottom 12 countries by inequality > gini coefficient > level are Cold countries'.
- Sweden ranked last for inequality > gini coefficient > level amongst Non-religious countries in 2009.
- Australia ranked last for inequality > gini coefficient > level amongst English speaking countries in 2009.