Its Gini index, a measure of income inequality, dropped from 0.63 to 0.52 from 1989 to 2009.
Among the BRIC nations, only Brazil is worse with a Gini index of around 0.57.
The Gini coefficient in China has worsened since reforms began in 1978, ADB noted.
Singapore's "Gini coefficient" the best-known economic measure of income disparity is the second highest in the developed world.
The Census Bureau publishes the Gini Index, which is the official measure of income inequality.
America's Gini coefficient has risen from 0.34 in the 1980s to 0.38 in the mid-2000s.
The Gini index ranges from 0, which represents perfect equality, to 1, for absolute inequality.
The Gini for rural China was around 0.39 in 2011, worse than the national average.
In most Latin American countries the Gini coefficient in 2010 was lower than in 2000.
Back in the 70s, China was mostly equally poor, so the Gini rating of the country was 0.16.
Thus, the measure of inequality (Gini coefficient) fell from 0.518 in 2009 to 0.501 in 2011 in Brazil.
In the Gini measurement, zero means perfect equality and 1 means total inequality.
Most Americans had never heard of the Gini Coefficient until they read about it in Time magazine this past summer.
The Gini index value for the United States in 2011 was 0.475, higher than it was in 2010 at 0.469.
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Singapore's Gini coefficient, a measure of inequality, rose from 0.444 in 2000 to 0.481 in 2008 higher than in China and America.
Venezuela now has the lowest levels of economic inequality of any Latin American country as measured by the Gini coefficient.
In January, China's National Bureau of Statistics released an official Gini coefficient reading for the first time in ten years.
The Gini aggregates all disparities, so it is a better summary measure, but it does not tell you where the gaps are growing.
Taking into account the existence of hidden income, the Gini coefficient of household income distribution is remarkably higher than the 0.47-0.50 calculated by different experts.
Gini coefficients and the top income share can paint different pictures.
For the first time in years, the National Bureau of Statistics last month disclosed China's Gini coefficient a key measure of inequality named after an Italian statistician.
Inequality, as measured by the Gini coefficient, has been rising since 1981 and now compares badly with other developed economies, being roughly on a par with Argentina.
Contributing to the lower Gini index are lower unemployment, increasing minimum wage and Bolsa Familia (a government program that pays poor families to keep their children in school).
The most common measure of inequality is the Gini coefficient.
This (as measured by the Gini index, also marked on the chart) has fallen sharply in Brazil since 1993, while it has soared in China and risen in India.
To put this phenomenon in more precise terms: The Gini coefficient for income in the U.S., a number that quantifies a society's lack of economic equality, has been creeping up.
The Gini index, which measures inequality, has declined from 64 in 1989 to 56 in 2009 where an index of 0 means perfect equality (the US Gini index was 45 in in 2009).
China's Gini coefficient measuring income distribution is also generating "widespread controversy and doubts" that it is too low and at odds with public perceptions, The Beijing News and People's Daily report.
Those whose instincts lead them to blame the Gini on President Bush will be surprised to find that the upward creep has been going on for decades, and was particularly pronounced under Bill Clinton.
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