@Strandjunker And limit wealth accumulation. I'd say US$500,000,000 total assets. After that, 95% tax rate.
I would make one exception: the actual individual inventors, artists, entertainers (incl sports) could accumulate more if people liked their stuff that much. But not something anyone could buy the rights to. And not transferable by inheritance or otherwise.
The accumulation of money and power are the biggest toxins.
@quixote @Strandjunker
I think a infinitely progressive income tax is a good idea. It should include stock trading profits too.
For removing wealth from the super rich fair inheritance taxation would also be neccessary, but should also certainly be doable.
A tax an wealth is also possible, but can be very difficult to implement, as the worth of many objects is very much a topic of debate (for example art). To go through that effort for the few ultrarich should be possible though...