Well, I ask this out of intellectual interest, and not to advocate communism or something....

But math suggests that if not for the concentration of wealth being so distributed in favor of the top end of the economy, the whole world would have an annual income of about 180,000 dollars.

Since the US is the main home of the top end of the wolrd economy, couldn't one easilly suggest that the world economy might improve overall if the US economy came down?