If it wasn't for Ben “the Hero” Bernanke's courage to print like a drunken Keynesian madman, none of this would have been possible, and by “this” we of course mean that the net worth of the top 0.1% of Americans is about to surpass the wealth of the bottom 90% of US households.
That, and making Thomas Piketty's sequel, is just a matter of time.
The good news is that the wealth gap is not quite as bad as it was in 1929 when the top 0.1% owned 25% of all wealth, almost double the 16% generously “trickling down” to the “poorest” 90% of the US population.