00382pab a2200133 454500008004000000100002400040245006600064260000900130300001200139362001000151650002200161700002000183773004500203180718b1987   xxu||||| |||| 00| 0 eng d  aHalter, William, A.  aThe impact of demographic change on social security financing  c1987  a471-502  aSept.  aInsurance, Social  aRichard Hemming  aInternational Monetary Fund Staff Papers