Global Centrality and Income Inequality in U.S. Metropolitan Areas: A Test of Two Hypotheses

Abstract

This article provides a quantitative assessment of two global city hypotheses: Sassen’s polarization and Hamnett’s professionalization claims. We conduct our analysis by using a continuous measure of global city status developed by researchers at the Global and World Cities Research Network (GaWC) and examining its correlation with the Gini index of household income inequality with relevant controls across a large sample of U.S. metropolitan areas in 2008. We examine industrial employment distribution as a causal pathway by which global city formation may influence urban income structures, as per Sassen and Hamnett’s original hypotheses. Results show that global city status is consistently associated with higher levels of inequality, but neither theorist’s claims about causal mechanisms are supported. This begs the question: What explains the correlation? We suggest an alternative hypothesis relating global city status to the distribution of educational credentialing.