Cheryl Wehler, Linda F. Weinreb, Kenneth Fletcher, and Robert Goldberg are with the University of Massachusetts Medical School, Worcester. Nicholas Huntington is with the National Center on Family Homelessness, Newton Center, Mass. Richard Scott is with Honors College, University of Central Arkansas, Little Rock. David Hosmer is with the University of Massachusetts, Amherst. Craig Gundersen is with the Economic Research Service, US Department of Agriculture, Washington, DC.