World Inequality Report

World Inequality Report
Name	World Inequality Report
Authors	World Inequality Database Consortium
Country	International
Language	English
Subject	Inequality
Publisher	World Inequality Lab
Pub date	2018, 2022

World Inequality Report is a major comparative analysis produced by the World Inequality Database Consortium that documents income and wealth disparities across countries, regions, and time. The report presents long-term series and cross-sectional estimates used by scholars, policymakers, and institutions such as the International Monetary Fund, World Bank Group, United Nations, Organisation for Economic Co-operation and Development, European Commission, African Union, and G20. It synthesizes data involving national agencies like the U.S. Census Bureau, Instituto Nacional de Estadística (Spain), INSEE, and private sources including tax administrations and surveys from countries such as United States, China, India, Brazil, and South Africa.

Overview

The report provides harmonized estimates of top-income shares, wealth concentration, and redistribution measures, comparing regions like North America, Europe, Latin America, Sub-Saharan Africa, South Asia, East Asia, and Middle East and North Africa. It builds upon earlier inequality work by scholars and institutions including Thomas Piketty, Emmanuel Saez, Gabriel Zucman, Angus Deaton, Branko Milanović, Anthony Atkinson, OECD, and the Luxembourg Income Study. The dataset underpins analyses that reference policymakers and leaders such as Christine Lagarde, Joseph Stiglitz, Janet Yellen, David Cameron, and Emmanuel Macron when debating taxation, social protection, and fiscal policy reforms.

History and Development

Origins trace to collaborative projects involving academic centers like the Paris School of Economics, University of California, Berkeley, London School of Economics, Harvard University, and think tanks such as Brookings Institution and Peterson Institute for International Economics. Influences include seminal works and events: Capital in the Twenty-First Century, the 2008 financial crisis, the Great Recession, and reports by International Labour Organization and United Nations Development Programme. Major editions were released following initiatives at conferences such as the World Economic Forum and meetings of the United Nations General Assembly, with leadership from researchers affiliated with institutions like the World Bank, IMF, European Central Bank, and national statistical offices including Statistics Canada and the Australian Bureau of Statistics.

Methodology and Data Sources

The report combines administrative tax records, national accounts, household surveys, and wealth registries, drawing on sources such as the Internal Revenue Service, Her Majesty's Revenue and Customs, China National Bureau of Statistics, Statistics South Africa, and estate records from jurisdictions like France, Germany, Japan, and Switzerland. Methods adapt approaches from academic literature by Piketty, Saez, Zucman, and Atkinson to reconcile top-coded survey data and underreported wealth in capital accounts exemplified by studies of offshore finance and leaks such as the Panama Papers and Paradise Papers. Statistical techniques reference work by Herman Daly, Robert Lucas, Angus Deaton, and Simon Kuznets, and use replication standards promoted by the Open Science Framework and data infrastructures like the World Bank Microdata Library.

Key Findings and Trends

The report identifies rising top-income and top-wealth shares in countries including United States, China, India, Russia, and many Latin American states since the 1980s, while several Western European countries show comparatively stable shares due to progressive taxation and social transfers exemplified in policy regimes of Sweden, Denmark, and Germany. It documents divergent trajectories across periods associated with events such as the Oil Crisis (1973), the Collapse of the Soviet Union, the Asian Financial Crisis, and the COVID-19 pandemic. Findings highlight the concentration of wealth in cities like New York City, London, and Hong Kong, and draw attention to gender and racial disparities with comparative references to studies from United Kingdom, Canada, Brazil, and South Africa. The report quantifies fiscal redistribution effects, comparing tax regimes influenced by policies debated in legislatures such as the United States Congress and the European Parliament.

Policy Implications and Criticism

Recommendations emphasize progressive taxation, wealth taxes, stronger tax administration, and expanded social transfers, citing policy instruments considered in countries like France, Argentina, Spain, Portugal, and Norway. Critics include commentators from institutions such as the Heritage Foundation, Cato Institute, Adam Smith Institute, and some economists affiliated with Chicago School of Economics, who raise concerns about measurement, behavioral responses, and capital mobility illustrated by case studies in Ireland, Luxembourg, and Singapore. Debates reference legal frameworks like Double Taxation Treaties, regulatory responses in forums such as the G20 and OECD Base Erosion and Profit Shifting project, and contested empirical assumptions discussed in academic journals represented by American Economic Review and Quarterly Journal of Economics.

Reception and Impact on Research and Policy

The report has influenced public debates and policy proposals by actors including European Commission President Ursula von der Leyen, U.S. Treasury Secretary Janet Yellen, Pope Francis, and civil society organizations like Oxfam and International Trade Union Confederation. It has spurred empirical follow-ups in research centers such as NBER, CEPR, IZA Institute of Labor Economics, and university departments at Oxford University, Cambridge University, and Princeton University. National fiscal reforms in jurisdictions such as Chile, Colombia, and Italy have cited inequality evidence in legislative debates before bodies like the Congreso de los Diputados (Spain) and the U.S. House of Representatives. Academic citations appear across publications by Cambridge University Press and MIT Press.

Category:Inequality studies