How it works
Sam, Rio and Kit each earned ten coins a year, but they saved different shares: Sam two, Rio five, Kit eight.
Saving a bigger share fills the jar faster. Spending less each year makes the jar last longer.
Kit worked the fewest years and rested the longest. But Kit lived on very little, with little left for surprises.
There are honest limits: prices rise, a jar can run out, its value can swing, and no plan suits everyone.