Income inequality refers to the extent to which income is distributed in an uneven manner. Within a society can be measured by various methods, including the Lorenz curve and the Gini coefficient. Economists generally agree that certain amounts of inequality are necessary and desirable but that social injustice can cause excessive inequality which leads to efficiency problems.[1]
National income, measured by statistics such as the Net National Income (NNI), measures the total income of individuals, corporations, and government in the economy. For more information see measures of national income and output
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