The double taxation comes from people who have already paid federal income taxes on their savings would then have to pay federal sales tax when they tried to spend their savings.
I agree with this, yournghtmare. however if we keep the income tax then people who have paid federal income tax on their savings will still pay the tax built into prices (or as i've seen some say that the cost will be paid by lower wages). so either way, income tax or fair tax, people are going to be taxed when they spend.
under the fairtax, much of the tax is visible. that's the difference i see so far. i don't know about the amount of tax though. is the amount of hidden tax the same as the amount of sales taxes in fair tax? different? or are there differing opinions (likely). where can i go to find info on my own?