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> they invest it.

But, if such a system was in place, the money would be taxed during the purchase of the investment vehicle. A sale is a sale. Unless the money is literally stuck in a mattress, it is going to be taxed upon doing anything useful with it. If it is simply stuck in a mattress for all of eternity, one is really no further ahead. Money only has value when you can use it to facilitate a sale; and when there is a sale there would be a tax.