| | The World Factbook 2004 -- Field Listing - Distribution of family income - Gini index |
 | | This index for an economy is calculated from the Lorenz curve, in which cumulative family income is plotted against the number of families arranged from the poorest to the richest. |
 | | The index is the ratio of (a) the area between a country's Lorenz curve and the 45 degree helping line to (b) the entire triangular area under the 45 degree line. |
 | | The more nearly equal a country's income distribution, the closer its Lorenz curve to the 45 degree line and the lower its Gini index, e.g., a Scandinavian country with an index of 25. |
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