Objectives-Socioeconomic segregation rose substantially in U.S. cities during the final decades of the 20 th century and we argue zoning regulations are an important cause for this increase.Methods-We measure neighborhood economic segregation using the Gini Coefficient for neighborhood income inequality and the poor-affluent exposure index. These outcomes are regressed on an index of density zoning developed from the work of Pendall for 50 U.S. metropolitan areas, while controlling for other metropolitan characteristics likely to affect urban housing markets and class segregation.Results-For both 2000 and changes from 1990 to 2000, OLS estimates reveal a strong relationship between density zoning and income segregation, and replication using 2SLS suggests that the relationship is causal. We also show that zoning is associated with higher interjurisdictional inequality.Conclusions-Metropolitan areas with suburbs that restrict the density of residential construction are more segregated on the basis of income than those with more permissive density zoning regimes. This arrangement perpetuates and exacerbates racial and class inequality in the United States.Since the mid-1970s, the United States has undergone a dramatic shift in its class structure (Danziger and Gottschalk 1995;Levy 1998). By 2005, inequalities of wealth and income had risen to levels last seen in the 1920s. In broad terms, those in the top fifth of the income distribution saw their income and wealth increase dramatically in real terms; those in the middle three fifths saw their income and wealth stagnate and their indebtedness grow; while those in the bottom fifth not only saw indebtedness grow, but experienced real declines in both wealth and income. Within the top fifth of the distribution, the higher up one goes, the greater the increase in income. Whereas the average income earned by the top 20% of households grew 55% in real terms from 1973 to 2003, the real gain for those in the top 5% was 75%, compared with just 13% among households falling at the median. Over the same period, the Gini Coefficient for household income inequality rose from .397 to .464 (Massey 2007).As the human ecologist Robert Park (1926) would surely have predicted, rising inequality in the social realm was accompanied by increasing separation in the spatial realm, and after 1970 segregation on the basis of socioeconomic status increased dramatically. Whether measured in terms of income (Jargowsky 1997;Massey and Fischer 2003;Fischer et al. Direct all correspondence to: Jonathan Rothwell, The Brookings Institution, 1775 Massachusetts Ave NW, Washington DC 20036, jrothwell@brookings.edu.
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Author ManuscriptSoc Sci Q. Author manuscript; available in PMC 2013 April 22. . Increasingly well-educated and the affluent people seemed intent on segmenting themselves off from the rest of American society, a trend that Reich (1992) labeled "the secession of the successful."While social scientists have long studied the causes and consequences of racial-ethnic s...