On the Relationship Between Mobility, Population Growth, and Capital Spending in the United States

In this paper, we investigate the relationship between public capital spending and population dynamics at the state level. Empirically, we document two robust facts. First, states with faster population growth do not spend more (per capita) to accommodate the needs of their growing population. Second, states whose population is more likely to leave do tend to spend more per capita than states with low gross emigration rates. To interpret these facts, we introduce an explicit, quantitative political-economy model of government spending determination, where mobility and population growth generate departures from Ricardian equivalence by shifting some of the costs and benefits of public projects to future residents. The magnitude of the empirical response of capital spending to mobility is at the upper end of what can be explained by the theory with a plausible calibration. In the model, more mobile voters favor more spending because the maturity of states' debt is very long term and costs are shifted into the future more than benefits.