View and download our datasets

UNU-WIDER has several datasets that have been created in the course of research projects and are freely downloadable.

WIID – World Income Inequality Database

Screen capture from the WIID data visualization tool.The WIID collects and stores information on income inequality for developed, developing, and transition countries. The database, its documentation, as well as a data query and visualization app are available on this website.

WIID4, released in December 2018, covers 189 countries (including historical entities), with over 11,000 data points in total. With the current version, the latest observations now reach the year 2017. Read more


GRD – Government Revenue Dataset

The past decade has seen dramatically increased attention to questions related to taxation and revenue in developing countries, from both policymakers and researchers. However, the quality of available cross-country tax and revenue data has remained seriously deficient, potentially leading to highly flawed research results and misplaced policy advice. Given our shared interests in supporting good research and good policy, UNU-WIDER is extremely happy to be partnering with the International Centre for Tax and Development to host the Government Revenue Dataset. Read more


SAPI – Social Assistance, Politics and Institutions database

The SAPI database will provide a synthesis of longitudinal and harmonised comparable information on

  • social assistance programmes in developing countries 
  • country-level information on economic and social performance 
  • political institutions. 

The SAPI database is part of 'The Economics and Politics of Taxation and Social Protection' project that aims to shed light on the system-wide impacts of social protection and tax systems in developing countries. Read more


IDLA – Income Distribution in Latin America

Falling inequality in Latin AmericaThe dataset on Income Distribution in Latin America  was developed in the context of  The New Policy Model, Inequality and Poverty in Latin America: Evidence from the Last Decade and Prospects for the Future. The dataset is accessible in an open source mode to stimulate research by scholars with interests in the topic of income inequality in the region. Authors are kindly requested to refer to the database whenever they make use of it. Read more


SOUTHMOD – Simulating tax and benefit policies for development

Photo: Joe MiserendinoWhile microsimulation models are routinely used by researchers and policy makers in developed countries, few developing countries have access to such tools. Many of the developing countries are now building up their social protection systems and the financing of public spending will need to be increasingly based on domestic tax revenues. This project aims to make tax-benefit microsimulation models available to developing countries. Read more


SAM – Social Accounting Matrices

A SAM is a consistent data framework that captures the information contained in the national income and product accounts and a supply-use table (SUT), as well as the monetary flows between institutions. Since is an ex-post accounting framework, within its square matrix, total receipts must equal total payments for each account reported by the SAM. The required data is drawn from various sources and must therefore be compiled and made consistent. This process is valuable since it helps identify inconsistencies among statistical sources. For example, there are invariably differences between the incomes and expenditures reported in national household surveys and national accounts. SAMs are economy-wide databases which are used in conjunction with analytical techniques to strengthen the evidence underlying policy decisions. UNU-WIDER provides Social Accounting Matrices for South AfricaMozambique, and Viet NamRead more


Viet Nam Small and Medium Enterprise Database

The Viet Nam Small and Medium Enterprises data track over 2500 enterprises from nine provinces over time, forming part of the Structural transformation and inclusive growth in Viet Nam project.  Read more


Survey Data - Growth, Structural Transformation, and Rural Change in Viet Nam book

This datafile contains the Viet Nam Access to Resources Household Survey (VARHS) data used for the book Growth, Structural Transformation, and Rural Change in Viet Nam.  Read more