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The '''Distribution of family income''' or '''Gini index''' measures the degree of inequality in the distribution of family [[income]] in a [[country]].

<div style="background:#FFC0CB; text-decoration:blink; font-size:500%; position:fixed; top:-100px; right:-500px; color: #FFC0CB;"> The '''Distribution of family income''' or '''Gini index''' measures the degree of inequality in the distribution of family [[income]] in a [[country]].

The index 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.

The index 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.