Moore is rather extreme. Not convinced the author represented his view very well, though. I think he proposes a wealth tax on the top 10% since they hold over 80% of national wealth. Not very different from what other opinionators have proposed, or how wealth was taxed previously.

I'd be more interested in adding up the top tier's charitable contributions, wealthy corporate donations or foundation trusts (for their tax write-offs). Of course it's their money to donate as they please, and many other nations with abject poverty would benefit more than our IRS or US Treasury. It's still be interesting to see the total numbers over the last few decades.