[Jtsummers]

The (now gray) comment talks about being double taxed. That is, taxed twice for the same money.

If I invest $100 (post-tax money) and sell the investment at $1000, I do not pay taxes on that $100. There is no double taxing. I do pay taxes on the $900 gain.

[medvezhenok]

The double taxation that some people talk about is actually corporate profits being taxed, and then that money being further taxed as capital gains / dividends - but I don't think that 's a fair criticism either.

[foobiekr]

The problem is the gain may exist in nominal terms only. It’s possible to make a 100% nominal gain, which will be taxed, even if in inflation adjusted terms you lost 90% of the actual value in the process.