TY - JOUR AU - Blocker,Alexander W. AU - Kotlikoff,Laurence J. AU - Ross,Stephen A. TI - The True Cost of Social Security JF - National Bureau of Economic Research Working Paper Series VL - No. 14427 PY - 2008 Y2 - October 2008 UR - http://www.nber.org/papers/w14427 L1 - http://www.nber.org/papers/w14427.pdf N1 - Author contact info: Alexander W. Blocker Harvard University E-Mail: ablocker@gmail.com Laurence J. Kotlikoff Department of Economics Boston University 270 Bay State Road Boston, MA 02215 Tel: 617/353-4002 Fax: 617/353-4001 E-Mail: kotlikoff@gmail.com Stephen A. Ross MIT Sloan School of Management 100 Main Street, E62-616 Cambridge, MA 02142 Tel: 617/258-8371 Fax: 203/772-1365 E-Mail: sross@mit.edu AB - Implicit government obligations represent the lion's share of government liabilities in the U.S. and many other countries. Yet these liabilities are rarely measured, let alone properly adjusted for their risk. This paper shows, by example, how modern asset pricing can be used to value implicit fiscal debts taking into account their risk properties. The example is the U.S. Social Security System's net liability to working-age Americans. Marking this debt to market makes a big difference; its market value is 23 percent larger than the Social Security trustees' valuation method suggests. ER -