You cannot do that with private companies. It is only restricted to public securities. And even these are not owner/investor stocks (which are locked for a certain period after company goes public via IPO). These are typically fresh stocks issued before company goes public.
> This is not a universal truth.
What is the evidence for it working otherwise? Every Country that has tried Wealth Tax has rolled it back.
> A lesser gain is not a loss.
It is not a capital gains tax (which already exists). Wealth tax is a tax on unrealized gains. It definitely leads to erosion of stock value.
> 1) Why not. 2) Sounds like someone needs an income (which is already taxed and would have solved much of the tax avoidance).
You have just encountered a classic Catch-22 here. Without income, you cannot pay tax. Without paying tax, you have no revenue and hence no income.