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World Income Inequality Database (WIID), collects and stores information on income inequality for developed, developing, and transition countries. WIID provides the most comprehensive set of income inequality statistics available and can be downloaded for free.
The WIID3.4, released in January 2017, covers six new countries, and more than 1,500 new observations have been added to the previous revision. The current version includes observations for two more years, with the latest observations now reaching the year 2015. In addition to the raw data, which can be downloaded here, we now also provide an interactive visualization tool.
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In the media
Nigerian daily business paper draws on the WIIDAn editorial published in Business Day, a daily business newspaper based in Lagos, has drawn on the World Income Inequality Database (WIID) to point to Nigeria’s growing inequality. The piece uses the database along with measures from the...
Database
World Income Inequality Database - WIID3.4The current revision ― WIID3.4 ― is an update of the third major revision of the database, WIID3. The current version includes observations for six additional countries, with the latest observations now reaching the year 2015. In total, the data...
News
New data on income inequality – WIID3.4 releasedThe UNU-WIDER World Income Inequality Database ― widely known by its acronym WIID ― collects and stores information on income inequality for developed, developing, and transition countries. WIID provides the most comprehensive set of income...
Seminar
Inequality - Trends worldwide and in India
Article
What is inequality?Inequality is typically viewed as different people or households having different degrees of living standards. Thus, inequality is concerned with the relative position of different individuals (or households) within a distribution. Why does it...
Database
Previous versions of the WIIDWIID3.0 consists of a checked and corrected WIID2.0 and new estimates from National Survey statistics obtained from the respective country official websites, the Socio-Economic Database for Latin America and the Caribbean, Transmonee, Luxembourg...
About
Frequently asked questionsQ: What should I cite as the source when I use WIID for publications? Please refer to the data set as: UNU-WIDER, ‘World Income Inequality Database (WIID3.4)’, January 2017. Q: Why are there several estimates reported per country and...
Database
WIID3.3WIID3 consists of a checked and corrected WIID2 and new estimates from National Survey statistics obtained from the respective country official websites, the Socio-Economic Database for Latin America and the Caribbean, Transmonee, Luxembourg Income...
Video
Inequality: What next?Parallel 3.1 of the 30th anniversary conference. Presenters: Ravi Kanbur, Jukka Pirttilä and Finn Tarp.
Journal Article
Response to Professor Stephen Jenkins’ comments on the World Income Inequality Database (WIID)Professor Stephen Jenkins (this issue) has conducted an extremely careful and insightful analysis of two datasets, WIID and SWIID...
Equality and inequalityNews
Stephen Jenkins on the World Income Inequality DatabaseThe Society for the Study of Economic Inequality has commissioned a series of papers appraising databases containing information about inequality in different countries and globally.These evaluations are forthcoming in a special issue of The Journal...
WIID InequalityBlog
Inequality in Focus at UNU-WIDER27 August 2014 Jukka Pirttilä and Tony Addison The last few months have seen major research activity in the area of inequality at UNU-WIDER. An update of the World Income Inequality Database (WIID) was first published in June...
Equality and inequality Methodology (Poverty) Methodology (Quantitative research)Context
Main subject
Theme: Current, Inclusion