or force transparency on ownership of everything. If something is owned by a nest of shell companies, ownership is transferred to the appropriate sovereign fund and managed for the public good. Combine transparency with the increasing difficulty of holding on to marginal dollars as a de facto way of capping income and wealth.

we could also learn from ideas associated with https://en.wikipedia.org/wiki/Socialist_economics. I'm not saying they are all good ideas, but they are worth testing out and looking for historical examples of where they worked or failed.