The World Inequality Report 2018 compiled by Facundo Alvaredo, Lucas Chanel, Thomas Piketty, Emmanuel Saez, and Gabriel Zucman[10] was released on December 14, 2017 at the Paris School of Economics during the first WID.world Conference held on December 14 and December 15, which was sponsored by the Paris School of Economics, the Institute for New Economic Thinking (INET), the Washington Center for Equitable Growth (CEG), the Ford Foundation, and the European Research Council.[11] World Wealth and Income Database (WID), an open source database, which is part of an international collaborative effort of over a hundred researchers in five continents. The WID is an extension of the earlier World Top Incomes Database (WTID).[12]