Andrew Biggs listed an address for a publication of the Social Security Advisory Board. The link may not work as posted. To seen all the publications of the SSAB, go to http://www.ssab.gov/NEW/publications.htm The paper featuring contributions from Peter Diamond, John Shoven and John Campbell can be found there. The title is "Estimating the Real Rate of Return on Stocks Over the Long Term, August 2001" Samuel H. Williamson Editor of SocSec