That's not really true, though.

It's true that if I buy some stocks for $100k I have (presumably) already paid taxes on that $100k. But if I sell the stock for $600k two years later, that extra $500k hasn't been taxed as income, and is only taxed as a capital gain.

> Capital gains taxes apply to both the rich and the poor, with the latter paying a whopping 0%.

Kind of silly to point that out. It's very easy for a "rich" person to have almost all of of their real income come from capital gains, but nearly impossible for many poor people to even have capital gains, much less arrange for it to be most of their income.