It's right out of 1880s America:
In China, less than 1% of households control more than 70% of private financial wealth.
So noteth the WSJ.
In the US today, we're talking somewhere between 40 and 45 percent.
Globally, says, John Bussey in the WSJ, the number is "nearly 40%," so America's not much off the norm.
But here's the biggest problem for China: a great deal of the wealth is connected to people with political positions (aka, the princelings like Bo Xilai and his now imprisoned wife). In the US, if you want to get rich, you need to stay out of government (or get rich before you go in, aka, the "fuck you money" that allows you to behave yourself while in power and quit on principle if need be).
For China to truly advance and become a genuine competitive threat, the political system has to decide to divorce wealth from political power. Otherwise we're looking at decay and decline and a very short "Chinese century."
US hit that moment and launched itself into a multi-decade progressive era that cleaned up a lot of things but government most of all.
As I have said many times, the world needs a small army of Teddy Roosevelts right now - but China most of all.