Wealth creation driven by R&D investment and wealth dilution caused by disconnected generations interact with households' fertility decisions, delivering a theory of sustained endogenous output growth with a constant endogenous population level in the long run. Unlike traditional theories, our...

We ask whether a pay-as-you-go financed social security system is welfare improving in an economy with idiosyncratic productivity and aggregate business cycle risk. We show analytically that the whole welfare benefit from joint insurance against both risks is greater than the sum of benefits...