If Social Security benefits were changed so those retiring at a later age got much more got substantially then the substitution effect would probably and the income effect would probably on the retirement age.

One day you learn that this same wealthy friend has become active in a community organization that serves the mentally challenged and their parents. you are told that her work with mentally challenged children consumes most of her weekends and a substantial part of her income and that she lives in modest circumstances. you find this hard to believe, and you suspect that somehow she is profiting from her involvement.