"This analysis uses data from the Health and Retirement Study (HRS) to examine the sources of variation in mortality for individuals of varying socio-economic status (SES). The use of the HRS allows a distinction between education and a measure of career earnings as primary determinants of socio-economic status for men and women separately. [The authors] use those predictions of mortality to estimate the distribution of annual and lifetime OASDI benefits for different birth cohorts spanning the birth years from 1900 to 1950. [They] find differential rates of mortality have had substantial effects in altering the distribution lifetime benefits in favor of higher income individuals."