"You honestly take these economists predictions seriously? How long have you been following the accuracy of their statements?"
Any forecast, economic or otherwise, has to be taken with a grain of salt. However, when the forecaster has credibility and the forecast seems to hang together logically, it is worthy of consideration IMHO.
The alternative, it seems to me, is to reject the President's call for a more "pro-growth" tax system. After all, if no forecasts can be relied upon, how does one know in advance that any proposal is "pro-growth"? I happen to agree with him that this is something that we need to address. We as a nation made this mess of a tax system and we as a nation can fix it.
I doubt that any forecast is going to be accurate to the tenth of a percent. That is why I expressed GDP growth as "above 10%". However, there is no doubt in my mind that the FairTax would unleash the real potential of this economy in a way that will surprise most Americans. I will leave it to others more learned in economics than I to quantify that development.