Both of those citations appear to be looking at income inequality measures rather than wealth inequality measures.

There are several chapters on wealth inequality in Piketty's book:

* https://en.wikipedia.org/wiki/Capital_in_the_Twenty-First_Ce...

Wealth is harder to measure because it's not as reported in most countries. You get an 'income slip' for tax purposes (e.g., US Form W-2), but there's no official 'wealth slip'.

That's one of the things that Piketty suggests: declaring of credits and debts in an official way, which could then be used for a (net) wealth tax. Starting as little 0.1% if you're just over (e.g.) $US 10M, and having a top rate of (e.g.) 2% for those that are worth more than (say) US$ 1B.

What is wealth but income accumulated over time?

(Or wealth stolen from others. Oops?)

Wealth is the integral of income minus expenses plus net unrealized gains over time. The latter two terms are pretty significant in the overall calculus, if you’ll pardon the (partial?) pun.

Yeah but what pays for rent and food? Income.