%0 Book Section %T Why are the disability rolls skyrocketing? The contribution of population characteristics, economic conditions, and program generosity %A Duggan, Mark %A Imberman, Scott A. %E Cutler, David M. %E Wise, David A. %D 2009 %P 337-379 %B Health at Older Ages: The Causes and Consequences of Declining Disability Among the Elderly %C Chicago, IL %I University of Chicago Press