I think given the options the really wealthy have, the other question is would a US wealth tax really have a large effect on currently US-based billionaires, or

I think given the options the really wealthy have, the other question is would a US wealth tax really have a large effect on currently US-based billionaires, or would it just cause a shift of those billionaires to be based elsewhere? Can you only have a really effective wealth tax if it's in coordination with a lot of other countries, as with the developments a couple years ago on a global corporate minimum tax?