This MRRC working paper was subsequently published as:
Powers, Elizabeth T., and Neumark, David. “The Supplemental Security Income Program and Incentives to Claim Social Security Retirement Early.” 58 National Tax Journal 5-26 (March 2005).
Elder, Todd E., and Powers, Elizabeth T. "The Incredible Shrinking Program: Will Cash Welfare for the Elderly Disappear?" Research on Aging 28, no.3 (May 2006): 341-358.