This paper addresses the problem of the sharing of longevity risk between an annuity provider and a group of annuitants. An appropriate longevity index is designed in order to adapt the amount of the periodic payments in life annuity contracts. This accounts for unexpected longevity improvements experienced by a given reference population. The approach described in the present paper is in contrast with group self-annuitization, where annuitants bear their own risk. Here the annuitants bear only the nondiversifiable risk that the future mortality trend departs from that of the reference forecast. In that respect, the life annuities discussed in this paper are substitutes for reinsurance and securitization of longevity risk.
City University, London, UKActuarial Science at Cass Business School
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Denuit, M., Haberman, S., & Renshaw, A. (2011). Longevity-indexed life annuities. North American Actuarial Journal, 15, 97-111. https://hdl.handle.net/2078.5/209829 (Original work published 2011)