I should have read the article before replying! Indeed, the article seems blind to capital taxes, focusing instead on income tax. Wealth tax is a pretty alien

I should have read the article before replying! Indeed, the article seems blind to capital taxes, focusing instead on income tax. Wealth tax is a pretty alien concept in the US -- I think it would face strong cultural resistance, and cause even more wealth flight to tax havens. And yet, I can see how it would tackle a big part of the problems described here. It may need to be implemented in a coordinated global fashion to avoid cheating. You'd need the rich nations to do it, with a working enforcement mechanism that spans international borders. That, combined with cultural resistance, sounds hard.