sentences:  Across Europe the ratio of post-tax income of the top 10% to that of the bottom 50% changed only slightly between the mid-1990s and 2019.Developing country comparative data is available from databases such as the Luxembourg Income Study (LIS) or the OECD Income Distribution database (OECD IDD), or, when including developing countries, from the World Bank's Povcalnet database, UN-WIDER's World Income Inequality Database, or the Standardized World Income Inequality Database.One 2013 study indicated that US market income inequality was comparable to other developed countries, but was the highest among 22 developed countries after taxes and transfers.