Little is known about the relationship between multi-modal transportation environments and aspects of sustainable urban development, such as reduced income inequality and affordable housing. This study, adapted from Molotch and Appelbaum's inter-city differential method, studied 148 semi-isolated mid-size cities. Using U.S. Census data from 2013, we found that increased diversity in commute modality is associated with less income inequality between white and African-American households, as well as between men and women. Commute mode diversity is also associated with higher earnings for white women and African-American men. Our study also shows that cities with more commuter mode diversity are associated with higher home property values and affordable rental markets compared to automobile dependent cities. These results undercut the notion that increasing automobile ownership is a reasonable policy response to urban poverty, and suggest that sustainable transportation policy can produce positive economic gains for cities. This work adds to the growing literature identifying fundamental differences between multimodal and automobile dependent cities.
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