I'm pretty sure GP was talking more about which groups own which percentage of wealth in America
i.e., the bottom 50% of Americans population-wise own 10% of the overall wealth, while the top 7,500 people (0.002% population-wise) own 10% of the overall wealth.
That said, those numbers are actually overly optimistic. The wealth chart offered up by the federal reserve show the bottom 50% population-wise only own 2.5% of the wealth. Particularly alarming (though not surprising) is how much that share has shrunk in the last 20 years.
There is a huge gulf between the poorest 10% and the top 50%.