Timeline of Economic Inequality
Ideas, measurements, and institutions shaping the distribution of income and wealth, from Rousseau's 1755 discourse to the World Inequality Report 2026, published in 2025.
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- Social Sciences
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- 17 events 1755 – 2025
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- by gpt-6
1755: Rousseau investigates the origins of inequality
Jean-Jacques Rousseau published his "Discourse on Inequality," distinguishing natural differences from inequalities sustained by social arrangements. His speculative history connected property and political institutions with unequal power and status.
https://en.wikipedia.org/wiki/Discourse_on_Inequality1817: Ricardo analyzes the distribution of production
David Ricardo published "On the Principles of Political Economy and Taxation." He examined how output was divided among wages, profits, and rent, placing distribution between economic classes at the center of political economy.
https://en.wikipedia.org/wiki/On_the_Principles_of_Political_Economy_and_Taxation1867: Marx publishes the first volume of "Capital"
Karl Marx analyzed capitalist production, wage labor, and surplus value in the first volume of "Capital". He argued that ownership and accumulation structured conflicts over the distribution of output; the work became a major source of competing interpretations of capitalism.
https://en.wikipedia.org/wiki/Das_Kapital1896 – 1897: Pareto describes a pattern in high incomes
Vilfredo Pareto's "Cours d'économie politique" examined income distributions and argued that upper incomes followed a recurring mathematical pattern. The Pareto distribution became a tool for describing concentration, although its parameters and applicability depended on the population studied.
https://en.wikipedia.org/wiki/Pareto_distribution1905: Lorenz develops a curve for concentration
Max Lorenz proposed plotting cumulative population shares against cumulative income or wealth shares. The Lorenz curve made distributions comparable with a line of perfect equality, providing a graphical tool without assuming one particular statistical distribution.
https://en.wikipedia.org/wiki/Lorenz_curve1912: Gini introduces an inequality coefficient
Corrado Gini introduced a numerical measure of dispersion that became widely used for income and wealth distributions. The Gini coefficient summarized inequality in one value, while leaving distinct distributions capable of producing the same score.
https://en.wikipedia.org/wiki/Gini_coefficient1942: Beveridge proposes a comprehensive insurance system
William Beveridge's report outlined a British social insurance system intended to address widespread insecurity and poverty. The proposals helped shape the postwar welfare state, illustrating how public institutions could alter the distribution of economic risks.
https://en.wikipedia.org/wiki/Beveridge_Report1955: Kuznets proposes an inequality-development hypothesis
Simon Kuznets suggested that inequality might first rise and then fall during economic development. He stressed the limited evidence available; the proposed inverted-U relationship became an empirical hypothesis rather than a universal law of growth.
https://en.wikipedia.org/wiki/Kuznets_curve1957: Becker models discrimination in markets
Gary Becker published "The Economics of Discrimination," analyzing how discriminatory preferences could affect wages, employment, and competition. The framework made discrimination an explicit subject of economic modeling without treating all observed pay differences as evidence of a single cause.
https://en.wikipedia.org/wiki/Gary_Becker1970: Atkinson links measurement to social judgments
Anthony Atkinson developed an inequality measure that made the evaluator's aversion to inequality explicit. His analysis showed that rankings of distributions could depend on normative choices, connecting statistical measurement with social welfare judgments.
https://en.wikipedia.org/wiki/Atkinson_index1971: Rawls proposes the difference principle
John Rawls published "A Theory of Justice," arguing that social and economic inequalities should meet conditions including benefiting the least advantaged. His framework supplied an influential philosophical standard for assessing institutions, distinct from measuring inequality statistically.
https://en.wikipedia.org/wiki/A_Theory_of_Justice1981: Sen explains famine through entitlements
Amartya Sen published "Poverty and Famines," showing how people could lose access to food without an overall collapse in food availability. His entitlement approach linked deprivation to wages, prices, property, and the ability to command resources.
https://en.wikipedia.org/wiki/Amartya_Sen2003: Piketty and Saez reconstruct top income shares
Thomas Piketty and Emmanuel Saez published long-run estimates of top United States incomes using tax records. Their series documented changes in concentration across the twentieth century and helped revive research on the distribution's upper tail.
https://en.wikipedia.org/wiki/Income_inequality_in_the_United_States2013: Piketty publishes "Capital in the Twenty-First Century"
Thomas Piketty's French edition brought historical income and wealth data into a broad argument about capital accumulation and inequality. The book emphasized institutions and historical shocks as well as the relationship between returns on capital and economic growth.
https://en.wikipedia.org/wiki/Capital_in_the_Twenty-First_Century2016: Milanović distinguishes global and national inequality
Branko Milanović published "Global Inequality," separating differences within countries from differences between them. His account examined globalization and the distribution of income growth across the world, including the pattern often called the elephant curve.
https://en.wikipedia.org/wiki/Branko_Milanovi%C4%872017: Researchers release the first World Inequality Report
The World Inequality Lab released the World Inequality Report 2018 in December. Drawing on tax records, surveys, and national accounts, it compared income and wealth concentration across regions while making methods and data central to the project.
https://en.wikipedia.org/wiki/World_Inequality_Database#World_Inequality_Report2025: The World Inequality Report broadens its measures
The World Inequality Lab published the World Inequality Report 2026 in December. The report extended its analysis of income and wealth to dimensions including gender, climate, and unequal access to education, with estimates tied to stated datasets and methods.
https://en.wikipedia.org/wiki/World_Inequality_Database#World_Inequality_Report