Throughout his career he has done a number of publications, including some 40 papers for the World Bank. mainly on world inequality and poverty. He is the author of the first work assessing global income inequality between individuals ("Economic Journal", January 2002). His 2005 book ("Worlds Apart") about global income disparity introduced three concepts of international inequality: unweighted inequality between mean country incomes, population-weighted inequality between mean country incomes, and global income inequality between all individuals in the world. He defined inequality possibility frontier in a 2006 paper on inequality in Byzantium ("Review of Income and Wealth", 2006). The concept, later expanded to 29 pre-industrial economies in a joint work with Jeffrey Williamson and Peter Lindert ("Economic Journal", March 2011), was considered by The Economist to "contain the germ of an important advance in thinking about inequality". Milanovic is the author of 2011's The Haves and the Have-Nots, a book of essays on income distribution;The Globalist selected The Haves and the Have-Nots as number one on its "top books of 2011". Milanovic currently serves on the advisory board for Academics Stand Against Poverty (ASAP). In August 2013, he was included by Foreign Policy among the top 100 "twitterati" to follow. In November 2014, he became external fellow in Center for Global Development in Washington.
He has been writing the blogglobalinequality since May 2014.