The problem of reverse causality between health and income means that any estimates of the impact of income on life expectancy could mistakenly reflect the influence of life expectancy (more generically, health) on income instead.
Tervise ja sissetuleku pöördvõrdelisest seosest tulenev probleemküsimus seisneb selles, et sissetuleku mõju hinnangud elueale võivad ekslikult peegeldada selle asemel eluea (üldisemalt tervisehoiu taseme) mõju sissetulekule.