The World Income Inequality Database (WIID) presents information on income inequality for developed, developing, and transition countries. It provides the most comprehensive set of income inequality statistics available and can be downloaded for free.
The latest version of the WIID, released in May 2020, covers 200 countries (including historical entities), with over 11,000 data points in total. With the current version, the latest observations now reach the year 2018. The data can be downloaded here. WIID is also available in the interactive visualization tool.
As a part of the UNU-WIDER 2019-23 work programme on transforming economies, states, and societies, we are now working to produce a user-friendly companion database to the classic WIID that will greatly simplify using the WIID for cross-country comparative analysis.
After 20 years of contributions to income inequality research, the WIID will get a new expansion to strengthen knowledge on income inequality. The companion WIID will provide an integrated series of income inequality for each country, best reflecting the trend over time, as well as new indicators of inequality — such as the Theil, the Atkinson, and the Palma index — alongside the income shares for the entire national distribution. It will also offer a complete estimated global income distribution over time. The WIID companion and an updated version of the WIID are planned for release in the first half of 2021.
The World Income Inequality Database project will also publish and disseminate new research on income inequality, create opportunities to engage, and host events.
Watch this space
All papers, data and opinion pieces relating to this project, as well as opportunities to engage will be available on this webpage.
This project centrally addresses SDG 10 (reduce inequality within and among countries).