Figure 6-1 Ratio of 90th percentile household income to 10th percentile, by state

SOURCES: Calculated from American Community Survey data; adapted from workshop presentation by Gad Levanon.

Finally, Levanon described work that he had done on housing characteristics and demand in support of the Demand Institute, a new joint venture sponsored by the Conference Board and Nielsen. Given the current economic climate, one factor that the Demand Institute was interested in learning about is the phenomenon of “doubling up”—multiple families or individuals sharing the same housing unit. Within that “doubling up” population, an important subgroup is young adults continuing to live in the parental home. Levanon said that the ACS data were extremely useful to illuminate some points about this population. He briefly displayed a chart using data from 2006 and 2010 ACS files examining the percentage change in home ownership rates, which varies inversely with age group; home ownership rates dropped by almost 18 percent among 20–24-year-olds and almost 14 percent for 25–29-year-olds, compared to only a 0.5 percent change among 65–69-year-olds. Part of this drop among young age categories seems attributable to “doubling up”; as shown in Figure 6-2, almost half of 20– 24-year-olds and a quarter of 25–29-year-olds postponed independent household formation and continued to live with their parents, as measured in 2010 ACS data. Even among 35–39-year-olds, 8 percent continued to live with parents—a

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