If you’re rich and invested in MSCI World ETF (stocks) 10 years ago, on Mar 28, 2015, the stocks exactly doubled (+ 107%) since then. That makes an average annual increase by 7.5%, considering how exponential growth works. (Formula is: (2.07^(1/10) - 1)*100%)

Source: www.finanzen.net/index/msci-world/charttool

This means that rich people’s assets literally proliferate by 7.5% annually, without lifting a finger. That means, it’s not their “hard earned fruits” or their “hard work”. They’re literally lazying around and their wealth increases by that amount.

I think it’s fair to tax that. Skim the unfair proliferation of wealth. Introduce a wealth tax, make billionaires pay 7.5% of their total wealth as an annual tax.