> he could be broke in ~10 years He could be broke in 10 minutes, if he turned all his money into $100 bills and burned them, or invested it all in some compan

> he could be broke in ~10 years He could be broke in 10 minutes, if he turned all his money into $100 bills and burned them, or invested it all in some company that immediately went bankrupt. But obviously he wouldn't do those things, because they would be stupid. And if he doesn't do stupid things, how is he going to be broke even in 10 years? If his current net wealth is $1B then he'd need to spend $100M every year even assuming zero investment gains. Again, it's not like spending $100M in a year is difficult if you are actively trying to go from being rich to being poor, but it's not the sort of thing that happens by accident.