I mean, at this level we're only talking about a few thousand people. So, studies are going to be hard to come by. Really, all you need is a thought experiment

I mean, at this level we're only talking about a few thousand people. So, studies are going to be hard to come by. Really, all you need is a thought experiment and to read about how it works for super-rich people. They typically never sell their stock. Instead, they borrow against it and use that for spending money. There was a recent article about Zuckerberg's estate planning, which was similar to what Sheldon Adelson apparently used. Some sort of complicated trust that projects returns on assets to avoid taxes or some such.