> It scales linearly. > If you have 3 (or 10) times as much as I have, and we both invest all our money in the same interest bearing account, then after N years

> It scales linearly. > If you have 3 (or 10) times as much as I have, and we both invest all our money in the same interest bearing account, then after N years you will still have 3 (or 10) times as much as I have. Right, it's linear relative to other interest bearing accounts, but GP's point was that existing wealth of an individual grows exponentially.