When we sold our startup in 1998 I suddenly got a lot of money. I now had to think about something I hadn't had to think about before: how not to lose it. I knew it was possible to go from rich to poor, just as it was possible to go from poor to rich. But while I'd spent a lot of the past several years studying the paths frompoor to rich, I knew practically nothing about the paths from rich to poor. Now, in order to avoid them, I had to learn where they were.