Theories of government spending driven by a common‐pool problem in the fiscal revenues pool predict that greater districting of a political jurisdiction raises the scale of government. This paper presents evidence on this and related predictions from a cross section of city governments in the United States. The main finding is that, when other plausible determinants of government spending are controlled for, greater districting leads to a considerably greater scale of government activity. The results also show that at‐large electoral systems do not, and forms of government that concentrate powers in the office of the executive do, break this relationship.

We investigate whether political jurisdictions form in response to the trade‐off between economies of scale and the costs of a heterogeneous population. We consider heterogeneity in income, race, ethnicity, and religion, and we test the model using American school districts, school attendance areas, municipalities, and special districts. We find strong evidence of a trade‐off between economies of scale and racial heterogeneity; we also find evidence of a trade‐off between economies of scale and income heterogeneity. Conversely, we find little evidence that ethnic or religious heterogeneity shapes jurisdictions. To clarify the direction of causality between heterogeneity and jurisdictions, we exploit shocks to racial heterogeneity generated by the two world wars.