I don't know . Depends on where it came from .
Doesn't depend on where it came from, unless the investor stole the money or it's being invested by a non-profit or a church, it was subject to taxes before he/she/it invested it. Even with deferred taxes (like 401K, IRA's) that principle still gets taxed.
My salary is taxed . And if I buy shit wh it, I get taxed again.
Even if you don't buy shit it gets taxed again by inflation, that's why small investors have to put their money into riskier investments than they otherwise would (so they have a shot at a rate of return that exceeds the rate of inflation).