Source: Leah Platt Boustan, Fernando V. Ferreira, Hernan Winkler, Eric M. Zolt, NBER Working Paper No. w16299, August 2010
From the abstract:
The income distribution in many developed countries widened dramatically from 1970 to 2000. Scholars speculate that inequality contributes to a host of social ills by weakening the public sector. In contrast, we find that growing income inequality is associated with an expansion in revenues and expenditures on a wide range of services at the municipal and school district levels in the United States. These results are robust to a number of model specifications, including instrumental variables that deal with the endogeneity of local expenditures. Our results are inconsistent with models that predict heterogeneous societies provide lower levels of public goods.