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AdvancedMacroeconomicsResearchandDevelopmentModelsNovember2,2015IntroductionTheSolow,RCKandOLGmodelsdonotprovidesatisfyinganswerstoourcentralquestionsabouteconomicgrowth.Underthosemodels,ifcapital’searningsreflectitscontributiontooutput,thencapitalaccumulationdoesnotaccountforalargepartofeitherlong-rungrowthorcross-countryincomedifferences.Example:monopolycompetition,Cobb-DouglasProduction1Firms:maxDFKLwLrKrK1L1DFFFDFFDFFK1KFrKDFDFFCapitalshare:FF1DFFDFIntroductionTheonlydeterminantofincomeintheSolow,RCKandOLGmodelsisthe“effectivenessoflabor”(A),whoseexactmeaningisnotspecifiedandwhosebehavioristakenasexogenous.Weneedtogobeyondtheexogenoustechnologicalprogress.Inthislecture,wewillexplicitlymodeltheeffectivenessoflaborasknowledge.Tomodeltheaccumulationofknowledge,weneedtointroduceanew“researchand