Mortality Perturbation Framework

The framework is a derivational note rather than an empirical study with fitted results or effect sizes. Saving lives at a perturbed age redistributes deaths to later ages according to a left-truncated lifespan distribution. Aburto et al.'s perturbation parametrization is accepted for analysis but treated as a choice that can be restated using standard changes in mortality. The note analyzes how infinitesimal age-specific mortality perturbations affect life expectancy and inequality measures.