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PolicyResearchWorkingPaper10880WhatData-RichAssessmentsofSocioeconomicInequalityandMobilityinRichCountriesOverlookinPoorCountriesRoyVanderWeideMichaelWoolcockDevelopmentEconomicsDevelopmentResearchGroupAugust2024PublicDisclosureAuthorizedPublicDisclosureAuthorizedPublicDisclosureAuthorizedPublicDisclosureAuthorizedProducedbytheResearchSupportTeamAbstractThePolicyResearchWorkingPaperSeriesdisseminatesthefindingsofworkinprogresstoencouragetheexchangeofideasaboutdevelopmentissues.Anobjectiveoftheseriesistogetthefindingsoutquickly,evenifthepresentationsarelessthanfullypolished.Thepaperscarrythenamesoftheauthorsandshouldbecitedaccordingly.Thefindings,interpretations,andconclusionsexpressedinthispaperareentirelythoseoftheauthors.TheydonotnecessarilyrepresenttheviewsoftheInternationalBankforReconstructionandDevelopment/WorldBankanditsaffiliatedorganizations,orthoseoftheExecutiveDirectorsoftheWorldBankorthegovernmentstheyrepresent.PolicyResearchWorkingPaper10880Advancesinthescaleandsophisticationofindividualincomedatacompiledacrosshigh-incomecountrieshaveenabledresearcherstomeasureinequalityandintergener-ationalmobilityatahighlygranularlevelandoverlongperiodsoftime.TheeditedvolumeMeasuringDistributionandMobilityofIncomeandWealth(Chettyetal(2022),comprising23empiricallyrichstudies,providesacom-prehensivestocktakingoft...