TY - BOOK AU - Bohn,Henning TI - Social security and demographic uncertainty : the risk sharing properties of alternative policies AV - HD7125 B636S PY - 1999/// CY - Cambridge, Mass PB - National Bureau of Economic Research KW - SOCIAL SECURITY KW - UNITED STATES KW - FINANCE KW - AGING KW - ECONOMIC ASPECTS KW - DEMOGRAPHIC TRANSITION KW - GENERATIONAL ACCOUNTING ER -