Family income is generally considered a primary measure of a nation's financial prosperity.
In the United States, political parties perenially disagree over which economic policies are more likely to increase family income. The party in power often takes the credit (or blame) for any significant changes in family income.
This index for an economy is calculated from the Lorenz curve, in which cumulative familyincome is plotted against the number of families arranged from the poorest to the richest.
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 more unequal a country's income distribution, the farther its Lorenz curve from the 45 degree line and the higher its Gini index, e.g., a Sub-Saharan country with an index of 50.
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