The paper examines pension reforms under population ageing. The concepts of implicit pension debtʺ, implicit taxʺ and internal rate of returnʺ are first introduced with the help of a three-period model. Using stylised facts, ageing is traced to low fertility and increasing longevity....

Purpose – This paper aims to analytically show that in an over-lapping-generation (OLG) model, low earning cohorts bear unwanted risk and absorb higher economic cost than high earning cohorts do. Design/methodology/approach – This paper aims to consider the individual’s risk appetite,...