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A 2011 Congressional Research Service report stated, "Changes in capital gains and dividends were the largest contributor to the increase in the overall income inequality. Taxes were less progressive in 2006 than in 1996, and consequently, tax policy also contributed to the increase in income inequality between 1996 and 2006.
Income from black market economic activity is not included. The Gini coefficient is a number between 0 and 1 or 100, where 0 represents perfect equality (everyone has the same income). Meanwhile, an index of 1 or 100 implies perfect inequality (one person has all the income, and everyone else has no income).
Further, variation in income inequality across developed countries indicate that policy has a significant influence on inequality; Japan, Sweden and France have income inequality around 1960 levels. [ clarification needed ] [ 81 ] The US was an early adopter of neoliberalism , which shifted the distribution of income from labor to capital, [ 82 ...
The Italian statistician Corrado Gini developed the Gini coefficient and published it in his 1912 paper Variabilità e mutabilità (English: variability and mutability). [16] [17] Building on the work of American economist Max Lorenz, Gini proposed using the difference between the hypothetical straight line depicting perfect equality and the actual line depicting people's incomes as a measure ...
While pre-tax income is the primary driver of income inequality, the less progressive tax code further increased the share of after-tax income going to the highest income groups. For example, had these tax changes not occurred, the after-tax income share of the top 0.1% would have been approximately 4.5% in 2000 instead of the 7.3% actual figure.
The inequality income metric should be independent of the aggregate level of income. This may be stated as: = where α is a positive real number. Population independence Similarly, the income inequality metric should not depend on whether an economy has a large or small population.
A typical Lorenz curve. In economics, the Lorenz curve is a graphical representation of the distribution of income or of wealth.It was developed by Max O. Lorenz in 1905 for representing inequality of the wealth distribution.
For =, (no aversion to inequality), the marginal social welfare from income is invariant to income, i.e. marginal increases in income produce as much social welfare whether they go to a poor or rich individual. In this case, the welfare equivalent equally distributed income is equal to mean income, and the Atkinson index is zero.