Typical of leftist analysis, this is firmly rooted in the assumption that it is fundamentally wrong that someone else has something that I don't. What the left refuses to recognize is that envy, which underlies every willful sin, is universally a part of fallen human nature (they don't believe in the Fall) and it is the fatal flaw in every human conceived economic system from communism and socialism to unrestrained free-market capitalism.
Inequality gets worse in any system. On the right the inequality is without question in wealth. But on the left the inequality is in power. In every case there is a group of elites whose wealth and/or power continues to grow, while those without those things continue to become poorer and less powerful.
So, is Piketty's solution, a world-wide wealth tax, a real answer to the problem? Of course not. The economic disruption that would occur simply sets the stage for chaos and devastation, opening the door to a global totalitarian regime. Good luck with that. Rather than wealth, the coin of that realm will be power, with an equally lopsided set of haves and have nots.
"You desire but do not have, so you kill. You covet but you cannot get what you want, so you quarrel and fight. You do not have because you do not ask God." James 4:2
“You desire but do not have, so you kill.”
The first premise in Buddhism. We suffer and cause suffering because we desire.
That’s why Christian Buddhists Rock.