I wish there were data that distinguished between top 1% by income and top 1% by wealth. Income inequality may be worth targeting in itself, but if the turnover of top-1% income earners is high it doesn't matter as much as if it's fixed. Similarly, if wealth is not being maintained generation after generation then concentration is not as important either.
Check out "Capital in the 21st Century" by Thomas Picketty. The picture is bleak, and it describes how the truly wealthy (top 1% of stored wealth) must self regulate or risk passing a tipping point.
And how they are failing to do so between 1980-2010, as modern conditions globally approach those of the French Revolution.
