"…[W]ith the dramatic rise in unmarried mothers giving birth (from 18 percent in 1980 to 41 percent in 2008), as well as a rise in the likelihood of single mother households falling below the poverty line (a scenario 9 times as likely to happen in 2009 as it was in 1990) single moms are facing persuasive — if stark — reasons to cohabitate. Add to that the reality that the average single mom makes just over $25,000 and the average cost of raising a child per year weighs in at $13,860…"
Epstein, Amy Levin. "Moving In with Single Moms: Is shared housing the new shape of parenting?" Babble. September 12, 2011.