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http://dx.doi.org/10.5351/KJAS.2018.31.1.077

Actuarial analysis of a reverse mortgage applying a modified Lee-Carter model based on the projection of the skewness of the mortality  

Lee, Hangsuck (Department of Actuarial Science/Mathematics, Sungkyunkwan University)
Park, Sangdae (Department of Actuarial Science, Sungkyunkwan University)
Baek, Hyeyoun (Social Insurance Research Department, Korea Institute for Health and Social Affairs)
Publication Information
The Korean Journal of Applied Statistics / v.31, no.1, 2018 , pp. 77-96 More about this Journal
Abstract
A reverse mortgage provides a pension until the death for the insured or last survivor. Long-term risk management is important to estimate the contractual period of a reverse mortgage. It is also necessary to study prediction methods of mortality rates that appropriately reflect the improvement trend of the mortality rate since the extension of the life expectancy, which is the main cause of aging, can have a serious impact on the pension financial soundness. In this study, the Lee-Carter (LC) model reflects the improvement in mortality rates; in addition, multiple life model are also applied to a reverse mortgage. The mortality prediction method by the traditional LC model has shown a dramatic improvement in the mortality rate; therefore, this study suggests mortality projection based on the projection of the skewness for the mortality that has been applied to appropriately reflect the improvement trend of the mortality rate. This paper calculates monthly payments using future mortality rates based on the projection of the skewness of the mortality. As a result, the mortality rates based on this method less reflect the mortality improvement effect than the mortality rates based on a traditional LC model and a larger pension amount is calculated. In conclusion, this method is useful to forecast future mortality trend results in a significant reduction of longevity risk. It can also be used as a risk management method to pay appropriate monthly payments and prevent insufficient payment due to overpayment by the issuing institution and the guarantee institution of the reverse mortgage.
Keywords
Lee-Carter model; reverse mortgage; longevity risk; the projection of future mortality; skewness;
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Times Cited By KSCI : 3  (Citation Analysis)
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