See the analysis I did here for someone:
http://www.freerepublic.com/focus/news/2792273/posts?page=50#50
What’s missing from most people’s analysis is the fact that approximatly 22% of the retail cost of items in the USA is due to federal taxes—taxes that are eliminated by the 999 plan and replaced by a 9% flat tax.
That still doesn’t address the issue of the state sales tax. Why is it better to pay tax to the feds than the states? What about states’ rights and de-centralization of government? The gist is that ‘9-9-9’ goes in exactly the wrong direction.