Gini Index and its relation to violent crime
"If the Gini index falls permanently by the within-country standard deviation in the sample (about 2.4 percentage points),the intentional homicide rate will decrease by 3.7 percent in the short run and 20 percent in the long run". (17)
Source: Pablo Fajnzylber, Daniel Lederman, and Norman Loayza"Inequality and Violent Crime," The World Bank, 2002. http://siteresources.worldbank.org/DEC/Resources/Crime%26Inequality.pdf [verified 4/17/14]