Gini coefficient

The Gini coefficient (also known as the Gini index or Gini ratio) is a measure of differences in income. It was developed by the Italian statistician Corrado Gini in 1912.

 Definition 
The Gini coefficient is usually a number between 0 and 1 (or 0 to 100). 0  means a country where the income is equally distributed. On the other hand, 1 means that one person owns everything but the rest owns nothing. In reality, all scores are between 0.25 and 0.6 (between 25 and 60 on the 0 to 100 scale).

 Statistics 
The table below is about the world Gini coefficient (not by single countries).
+ Income Gini coefficientWorld, 1820-2005 Year  World Gini index 1820  0.43 1850  0.53 1870  0.56 1913  0.61 1929  0.62  1950  0.64 1960  0.64  1980  0.66 2002  0.71 2005  0.68

The table below shows the income Gini coefficient of the United States from 1947 to 2009.

+ Income Gini coefficientUnited States, 1947-2009 Year  pre-tax Gini 1947  0.413 1967  0.397 1968  0.386 1970  0.394 1980  0.403 1990  0.428 2000  0.462 2005  0.469 2006  0.470 2007  0.463 2008  0.467 2009  0.468

 References 

Category:Socioeconomics
Category:Statistics
Category:Economic indicators