We develop a dynamic politico-economic model of public investment where decisions can be made at several levels of government: federal, state, or county. The model predicts that in the absence of internal mobility, the higher level of government would fund all investments that present positive...

We analyze the short and long run effects of demographic ageing---increased longevity and reduced fertility---on per-capita growth. The OLG model captures direct effects, working through adjustments in the savings rate, labor supply, and capital deepening, and indirect effects, working through...