Earlier quoted context omitted.
The rich aren't stashing most of their money under a mattress. Gates, Bezos, etc are worth billions, but that wealth is almost all based off of the stock prices in the companies they own percentagess of.
Tax the ownership interest in equities, just as we have property taxes for land ownership. We could also take the route of the Federal Reserve purchasing up equities (The Bank Of Japan does this [1]), issuing deposit accounts to citizens directly (trivial for the Federal Reserve to support this [disclaimer: I work in the financial services industry, and feel qualified to make this statement]), and providing UBI to th…
Are you proposing their equity also be taxed "at rest"? How would that work?