Gini coefficient of national income distribution around the world. This is based on 1989 to 2009 data, estimated by the CIA. Some are pre-tax, others post-tax income. The closer the coefficient is to 1, the greater the inequality. [click on this image to find a short clip and analysis of actual versus perceived inequality in the U.S.]
Income inequality: 5 things to know This article discusses the problem on income inequality increasing. Americans at the top of the income scale have their incomes rising more than those further down. As income inequality is increasing, how would the Gini coefficient change? What are the ways mentioned in the article to narrow the income inequality gap?
The Gini Coefficient: Calculating the Gini Coefficient
The Gini Coefficient, a method often used to measure income inequality, finds that more equal societies are happier. A 2010 study found that in the U.S., happiness levels off at about $75,000 annual income — anything more is superfluous.