I read an article about an American billionaire who said that this problem will soon affect everybody. But he also said that he will in future fear for his life and also for his business. Somebody needs enough income to buy what he is producing and selling. The billionaires will not buy all he is selling now. Pity I don't remember the name of this man, so I cannot google him and his article and give the link.
Found one, but not the one I was looking for:
http://www.cnbc.com/2015/06/11/billionaire-luxury-chief-says-wealth-gap-is-unfair.html
And this one too found on CNBC:
Hedge fund billionaire
Paul Tudor Jones said the growing gap between the rich and the rest could be "disastrous," and that the drive for corporate profits has "ripped the humanity" from American companies.
Speaking at a sold-out TED Talk in Canada this week, the co-chairman of Tudor Investment and a man
Forbes says is worth $4.6 billion, said current levels of inequality may be unsustainable.
"The gap between the 1 percent and the rest of America, and between the U.S. and the rest of the world, cannot and will not persist," he said. "Now here's a macro forecast that's easy to make, and that's that the gap between the wealthiest and the poorest, it will get closed. History always does it. It typically happens in one of three ways—either through revolution, higher taxes or wars. None of those are on my bucket list."