Economic inequality refers to the unequal distribution of income, wealth, or consumption among individuals, households, or groups within a population, or between populations across countries and regions. It is most commonly measured using the Gini coefficient, a statistic ranging from 0 (perfect equality, where every unit receives an identical share) to 1 or 100 (perfect inequality, where a single unit receives the entire share), though other measures - including the Palma ratio, top income shares, and wealth-to-income ratios - are also used. The Gini coefficient is the standard measure of income inequality and income distribution within countries, calculated from the Lorenz curve, which graphs cumulative income share against cumulative population share. The term encompasses several analytically distinct concepts - income inequality, wealth inequality, and inequality of opportunity - which are sometimes conflated in public debate. Whether a given level or trend in economic inequality represents a problem requiring correction, a neutral byproduct of a market economy, or in some cases a sign of healthy economic dynamism is contested; see economic-inequality-market-outcome-egalitarian-viewpoint-debate.

Economic inequality is tracked at multiple levels of analysis, and the distinction between them shapes much of the discussion:

• Within-country inequality - the distribution of income or wealth among residents of a single nation. South Africa, Namibia, Botswana, and Eswatini are among the countries with the highest measured income inequality, while Nordic and several Central European countries report comparatively low Gini coefficients. Lower Gini scores are generally associated with stronger social safety nets, progressive taxation, and broader access to education and economic opportunity, while higher scores are often linked to weaker redistribution policies.
• Between-country (global) inequality - the distribution of income across the world's population regardless of national borders. Researchers at the World Bank have found that the Covid-19 pandemic halted a multi-decade reduction in global income inequality and produced the largest single increase in global income inequality in at least three decades. The future trajectory of global inequality depends substantially on whether poorer countries grow faster than wealthier ones going forward.
• Wealth inequality - the distribution of accumulated assets (property, financial holdings, business equity) rather than annual income flows. Wealth is generally distributed more unequally than income in most economies, since wealth compounds over time and is concentrated among older cohorts and asset owners.
• Inequality of opportunity - disparities in starting conditions, such as access to education, family resources, or social capital, distinguished from inequality of outcome, which refers to disparities in final income or wealth after individual choices and effort are factored in. The relative importance of opportunity versus outcome is a central point of disagreement among viewpoints below.

National-level data is compiled by bodies such as the World Bank's Poverty and Inequality Platform and the OECD, drawing primarily on household surveys, with data referring either to income after taxes and benefits or to consumption per capita - measures that are not perfectly comparable, since consumption tends to be more evenly distributed than income. Cross-country comparisons are complicated by differing data collection methods, survey years, and whether pre-tax or post-tax, post-transfer income is used.

Two of the most consequential developments shaping the modern debate are economic globalization - the increased integration of trade, capital, and labor markets across countries - and the shift toward post-industrial, knowledge- and technology-based economies in developed nations. Both are widely credited with reducing between-country inequality (as manufacturing and supply chains shifted to lower-income nations) while their effect on within-country inequality in wealthy nations is disputed; see economic-inequality-globalization-debate. For historical background on the measurement and political salience of economic inequality, see economic-inequality-history.

There is broad, independently-arrived-at agreement among economists and statistical agencies that the Gini coefficient, despite its limitations, is a valid and standard tool for measuring income and wealth distribution within and across populations. This methodological consensus is distinct from any agreement on the normative significance of a given inequality level, which remains contested; see economic-inequality-measurement-consensus.

• Market Outcome Viewpoint - Holds that income and wealth differences primarily reflect differences in productivity, risk-taking, skill, and voluntary exchange in a market economy, and that inequality per se is not inherently unjust provided it arises from a fair process rather than coercion or fraud.
• Egalitarian Viewpoint - Holds that large disparities in income or wealth are themselves morally and socially problematic, regardless of how they arose, and that redistribution through taxation and social programs is a legitimate and necessary government function.
• Equality-of-Opportunity Viewpoint - Holds that the central concern should be ensuring fair starting conditions (education, legal equality, absence of discrimination) rather than equalizing final outcomes, and that inequality resulting from differences in effort or choice after a fair starting point is acceptable.
• Structural/Systemic Viewpoint - Holds that observed inequality, including disparities correlated with race, sex, or class background, primarily reflects structural or institutional barriers rather than individual differences in effort or ability, and that targeted policy intervention is required to correct them.
• Growth-Tradeoff Skeptic Viewpoint - Holds that redistributive policy aimed at reducing inequality frequently imposes efficiency costs that reduce overall economic growth, and that a focus on growth and absolute living standards is more beneficial to the poor than a focus on relative inequality.
• Globalization Critic Viewpoint - Holds that international trade liberalization and capital mobility have suppressed wages and hollowed out the middle class in developed countries, even while reducing poverty elsewhere, and that this tradeoff has been imposed without adequate domestic compensation for those displaced.
• Libertarian/Individualist Viewpoint - Holds that the proper unit of moral concern is the individual rather than statistical aggregates or group averages, that inequality measured across a population is not itself a meaningful harm absent a specific rights violation, and that coercive redistribution is itself an infringement on individual liberty regardless of its distributive effects.
• Religious/Communitarian Viewpoint - Holds that economic inequality raises moral obligations of charity, solidarity, and care for the poor grounded in religious or communitarian tradition, distinct from rights-based or efficiency-based framings, and that voluntary mutual obligation rather than either market outcomes or state redistribution alone should guide the response.

• The relationship between globalization-driven trade liberalization and the decline of manufacturing employment in developed economies remains a documented point of dispute among economists and policymakers. See economic-inequality-trade-deindustrialization-controversy.
• The use of pre-tax versus post-tax-and-transfer income data in measuring inequality, and the resulting disagreement over whether redistribution has meaningfully offset rising market-income inequality, is a documented controversy in economic measurement. See economic-inequality-pretax-posttax-measurement-controversy.
• The proper interpretation of rising top income shares (e.g., the “top 1%”) - whether driven by executive compensation norms, capital returns, rent-seeking, or skill-biased technological change - is a documented and ongoing dispute. See economic-inequality-top-income-shares-controversy.

• History of Economic Inequality
• Debate: Has Globalization Increased or Decreased Inequality?
• Debate: Does Redistribution Reduce Economic Growth?
• Viewpoint Debate: Market Outcome vs. Egalitarian Viewpoint
• Consensus: Gini Coefficient as a Standard (but Limited) Measure
• Controversy: Trade Liberalization and Deindustrialization
• Controversy: Pre-Tax vs. Post-Tax Inequality Measurement
• Controversy: Interpretation of Top Income Shares
• Capitalism
• Globalization
• Poverty
• Social Mobility

• World Bank Poverty and Inequality Platform, “Income inequality: Gini coefficient,” in Max Roser, “Economic Inequality,” Our World in Data, accessed June 26, 2026, https://ourworldindata.org/grapher/economic-inequality-gini-index.
• “Gini Coefficient by Country 2026,” World Population Review, accessed June 26, 2026, https://worldpopulationreview.com/country-rankings/gini-coefficient-by-country.
• Diana C. Garcia Rojas, Nishant Yonzan, and Christoph Lakner, “Global Inequality and Economic Growth: The Three Decades before Covid-19 and Three Decades After” (Washington, DC: World Bank, 2025), https://openknowledge.worldbank.org/entities/publication/2683322d-068d-4300-b0dc-532ca49c8c13.
• Organisation for Economic Co-operation and Development, “Income Inequality,” OECD Data Explorer, accessed June 26, 2026, https://www.oecd.org/en/data/indicators/income-inequality.html.